When it locks up like that does the sound stop and start as well?

You should give non-fullscreen mode a try (it may still look like fullscreen) just uncheck the Fullscrren box in the options screen and restart the game.

Okay.  While you're in the game, press Ctrl-F to turn on the framerate display.  It'll show as a number and (Shader) towards the top left of the screen.  If it drops dramatically while you're moving around the map, it could be that your video card is having trouble with keeping up with all the details or your current map size.

If that is the case, you could try turning down the video settings for the moment to see if that alleviates the problem.

Don't worry about the framerate being zero when you turn it on initially (or Alt-Tab back in) that's normal.

You might want to look at the Throttle Frame Rate option under the Video tab of the options screen, see if checking or unchecking it makes a difference.

Okay well, do you have the laptop plugged into the wall when you play, or do you run on batteries?  Laptops tend to cap their CPU usage when running under batteries to stay cool and conserve power.

Anyway, I'm not sure what else to try, perhaps contact support@stardock.com for resolution of this problem, include your debug.err file.

Where can I find this file?  What folder is it in?

Debug Message:  Version v2.04 Twilight of the Arnor last updated on: Tue Nov  1 11:59:59 2011
Debug Message:  Could not open reg key HKEY_CURRENT_USER SOFTWARE\Stardock\Drengin.net\GalCiv2UL
Debug Message:  Could not open reg key HKEY_CURRENT_USER SOFTWARE\Stardock\Drengin.net\GC2EU
Debug Message:  Could not query reg key HKEY_CURRENT_USER SOFTWARE\Stardock\Drengin.net value named Serial No
Debug Message:  Could not open reg key HKEY_CURRENT_USER SOFTWARE\Stardock\Drengin.net\GC2
Debug Message:  Could not query reg key HKEY_CURRENT_USER SOFTWARE\Stardock\Drengin.net\GalCiv2 value named Serial No
Debug Message:  Could not open reg key HKEY_CURRENT_USER SOFTWARE\Stardock\Drengin.net\GalCiv2\DarkAvatar
Debug Message:  Could not open reg key HKEY_CURRENT_USER SOFTWARE\Stardock\Drengin.net\GalCiv2\Twilight
Debug Message:  Can't find serial number.
Debug Message:  Checking DX Version.
Debug Message:  *********DXDiag info follows.*********
System Info
Time: 5/22/2012, 18:48:07
DirectX Version: DirectX 11
Machine Name: OWNER-PC
Operating System: Windows 7 Home Premium 32-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120330-1504)
Languages: English (Regional Setting: English)
System Manufacturer: Sony Corporation
System Model: VGN-AR230G
BIOS: Phoenix NoteBIOS 4.0 Release 6.1     
Processor: Intel(R) Core(TM)2 CPU         T5600  @ 1.83GHz (2 CPUs), ~1.8GHz
Physical Memory: 2048MB RAM
Page File: 1814MB used, 2277MB available
Windows Dir: C:\Windows


Display Info
Display device 1:
Device Name: \\.\DISPLAY1
Card Name: NVIDIA GeForce Go 7400  
Manufacturer: NVIDIA
Chip Type: GeForce Go 7400
DAC Type: Integrated RAMDAC
Key Device: Enum\PCI\VEN_10DE&DEV_01D8&SUBSYS_81FD104D&REV_A1
Display Memory: 333 MB
Current Display Mode: 1440 x 900 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Max Resolution:
Driver Name: nvd3dum.dll
Driver Version: 7.15.0010.9813
Driver Date: 2/20/2007 16:44:00
DirectX Acceleration Enabled: Yes
 


Sound info
Sound device 1:
Description: Speakers (High Definition Audio Device)
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: HDAUDIO\FUNC_01&VEN_8384&DEV_7664&SUBSYS_104D1300&REV_1002
Manufacturer ID: 1
Product ID: 65535
Driver Name: HdAudio.sys
Provider: Microsoft
Driver Version: 6.01.7601.17514
Driver Date: 11/20/2010 16:29:03
Type: WDM
Other Drivers:
Acceleration Level: 1
Cap Flags: 0
Min/Max Sample Rate: 0, 0
 
Sound device 1:
Description: Digital Audio (S/PDIF) (High Definition Audio Device)
Default Sound Playback: No
Default Voice Playback: No
Hardware ID: HDAUDIO\FUNC_01&VEN_8384&DEV_7664&SUBSYS_104D1300&REV_1002
Manufacturer ID: 1
Product ID: 65535
Driver Name: HdAudio.sys
Provider: Microsoft
Driver Version: 6.01.7601.17514
Driver Date: 11/20/2010 16:29:03
Type: WDM
Other Drivers:
Acceleration Level: 1
Cap Flags: 0
Min/Max Sample Rate: 0, 0
 


Debug Message:  *********END dxdiag info.*********
Debug Message:  Entering WinMain
Debug Message:  ******* Starting Game Shell *******
Debug Message:  Could not query reg key HKEY_LOCAL_MACHINE Software\Stardock\Drengin.net\GalCiv2UL value named Language
Debug Message:  Going Fullscreen
Debug Message:  Preparing to change display settings.
Debug Message:  Using hardware vertex processing
Debug Message:  Using multilsample setting: D3DMULTISAMPLE_2_SAMPLES
Debug Message:  Attempting to create D3DDevice at resolution 1440 x 900, Windowed: 0, Multisample: 2
Debug Message:  Game Resolution: 1440 x 900
Debug Message:  Running fullscreen.
Debug Message:  HAL (hw vp): NVIDIA GeForce Go 7400  
Debug Message:  D3DPRESENT_INTERVAL_DEFAULT
Debug Message:  Refresh rate: 60
Debug Message:  Bit Depth: 32 bit.
Debug Message:  *********Checking D3DDevice Caps***********************
Debug Message:  A full-color cursor is supported in hardware at high resolution modes.
Debug Message:  RGB in format 6:6:6, Masks reported as ff0000:ff00:ff
Debug Message:  Now Fullscreen
Debug Message:  Shell initialization complete
Debug Message:  GalCiv2 is activated.
Debug Message:  ***** Initializing Game *****
Debug Message:  Timer Frequency is 0 1b4065
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\./Data/ShipTemplates/\*.shipcfg
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\ships\*.shipcfg
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\shiptemplates\*.shipcfg
Debug Message:  Could not open reg key HKEY_LOCAL_MACHINE SOFTWARE\Stardock\ObjectDesktop\DesktopX
Debug Message:  Initializing sound card.
Debug Message:  initailizing bink
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar\Movies\techs\*.bik
Debug Message:  No files found matching mask Movies\techs\*.bik
Debug Message:  No files found matching mask Gfx\Tutorials\*.bik
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\Gfx\Movies\*.bik
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\sfx\*.wav
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\Music\*.mp3
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\Event Music\*.mp3
Debug Message:  Create setup screens.
Debug Message:  Clear galaxy settings.
Debug Message:  Clear influence.
Debug Message:  Clear up laws.
Debug Message:  Clear first time events.
Debug Message:  Clear wonders and trade goods.
Debug Message:  Clear sector mapper.
Debug Message:  Set mouse.
Debug Message:  Set update timer.
Debug Message:  No files found matching mask ./Data/*.xml
Debug Message:  Clear data definitions.
Debug Message:  Killing ship styles:
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\ships\*.xml
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\shiptemplates\*.xml
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate./Data/English/\ShipStyles\*.xml
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\ShipStyles\*.xml
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar./Data/\FleetFormations\*.fleet
Debug Message:  No files found matching mask ./Data/\FleetFormations\*.fleet
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar\Gfx\Planets\C0*.png
Debug Message:  No files found matching mask Gfx\Planets\C0*.png
Debug Message:  No files found matching mask gfx/Terrain/1SideN*.png
Debug Message:  No files found matching mask gfx/Terrain/1SideE*.png
Debug Message:  No files found matching mask gfx/Terrain/1SideS*.png
Debug Message:  No files found matching mask gfx/Terrain/1SideW*.png
Debug Message:  No files found matching mask gfx/Terrain/2SideN*.png
Debug Message:  No files found matching mask gfx/Terrain/2SideE*.png
Debug Message:  No files found matching mask gfx/Terrain/2SideS*.png
Debug Message:  No files found matching mask gfx/Terrain/2SideW*.png
Debug Message:  No files found matching mask gfx/Terrain/3SideN*.png
Debug Message:  No files found matching mask gfx/Terrain/3SideE*.png
Debug Message:  No files found matching mask gfx/Terrain/3SideS*.png
Debug Message:  No files found matching mask gfx/Terrain/3SideW*.png
Debug Message:  No files found matching mask gfx/Terrain/4SideN*.png
Debug Message:  No files found matching mask gfx/Terrain/4SideE*.png
Debug Message:  No files found matching mask gfx/Terrain/4SideS*.png
Debug Message:  No files found matching mask gfx/Terrain/4SideW*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/1SideN*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/1SideE*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/1SideS*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/1SideW*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/2SideN*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/2SideE*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/2SideS*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/2SideW*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/3SideN*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/3SideE*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/3SideS*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/3SideW*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/4SideN*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/4SideE*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/4SideS*.png
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\DarkAvatar/gfx/Terrain/4SideW*.png
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\ships\*.shipcfg
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\./Data/ShipTemplates/\*.shipcfg
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\ships\*.shipcfg
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\shiptemplates\*.shipcfg
Debug Message:  Reading Star Names
Debug Message:  Reading Star Names... Done
Debug Message:  No files found matching mask ./Data/English/Tutorials/*.xml
Debug Message:  GalaxyWnd: Cannot find OBJID Scenaro_MoreDetails_FText
Debug Message:  GalaxyWnd: Cannot find OBJID Scenaro_Details_FormattedText
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\Mods\Default\Data\CustomMaps\*.gc2map
Debug Message:  No files found matching mask ./Data/English/Scenarios/*.GC2Scenario
Debug Message:  No files found matching mask C:\Program Files\Stardock Games\GalCiv2Ultimate\Mods\Default\Data\Scenarios\*.gc2scenario
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\Backup\*.sav
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\CustomMaps\*.sav
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\Dark Avatar\*.sav
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\Gfx\*.sav
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\Metaverse\*.sav
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\SandboxGames\*.sav
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\ships\*.sav
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\ShipStyles\*.sav
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\shiptemplates\*.sav
Debug Message:  No files found matching mask C:\Users\Owner\Documents\My Games\GC2TwilightArnor\temp\*.sav
Debug Message:  Loading save game C:\Users\Owner\Documents\My Games\GC2TwilightArnor\QuickSave.sav
Debug Message:  Killing threads.
Debug Message:  Kiling civs.
Debug Message:  Killing ships.
Debug Message:  Killing rallypoints.
Debug Message:  Killing misc objects.
Debug Message:  Killing stars.
Debug Message:  Killing anomalies.
Debug Message:  Killing asteroid fields.
Debug Message:  Killing asteroid field mining bases.
Debug Message:  Killing space resources.
Debug Message:  Killing ascension crystals.
Debug Message:  Killing colonies and planets.
Debug Message:  killing scenario.
Debug Message:  Clearing Turn Event Log
Debug Message:  Clear galaxy settings.
Debug Message:  Clear influence.
Debug Message:  Clear up laws.
Debug Message:  Clear first time events.
Debug Message:  Clear wonders and trade goods.
Debug Message:  Clear sector mapper.
Debug Message:  Loading Custom Map
Debug Message:  Loading Data Defs
Debug Message:  Clear data definitions.
Debug Message:  Killing ship styles:
Debug Message:  Loading TechDefs
Debug Message:  Max num techs: 523
Debug Message:  Loading ImprovementDB
Debug Message:  Loading Component Defs
Debug Message:  Loading ShipTypes
Debug Message:  Loading ShipTemplates
Debug Message:  Loading ParsedHardpoints
Debug Message:  Loading AnomalyTypes
Debug Message:  Loading RandomEvents
Debug Message:  Loading UPIssues
Debug Message:  Loading ResourceTypes
Debug Message:  Loading InvasionTactics
Debug Message:  Loading SBmodules
Debug Message:  Loading PoliticalParties
Debug Message:  Loading Planet Types
Debug Message:  Loading Star Types
Debug Message:  Loading AFMBModules
Debug Message:  Loading ShipStyles
Debug Message:  Loading TechTrees
Debug Message:  Loading TechTreeDefs
Debug Message:  Loading Game
Debug Message:  Loading: Game mode is normal.
Debug Message:  Loading Galaxy
Debug Message:  Game started in version v2.04 Twilight of the Arnor
Debug Message:  Sectors across: 8 x 8
Debug Message:  Loading FOW Map
Debug Message:  Loading ZOC Map
Debug Message:  Loading Planets
Debug Message:  Loading Stars
Debug Message:  Loading Anomalies
Debug Message:  Loading Resources
Debug Message:  Loading AscensionCrystals
Debug Message:  Loading AsteroidFields
Debug Message:  Loading AFMiningBases
Debug Message:  Loading Civs
Debug Message:  Loaded Civ Korath Clan who has intelligence 65
Debug Message:  Loaded Civ Altarian Resistance who has intelligence 65
Debug Message:  Loaded Civ Torian Confederation who has intelligence 65
Debug Message:  Loaded Civ Iconian Refuge who has intelligence 65
Debug Message:  Loaded Civ Thalan Empire who has intelligence 65
Debug Message:  Loaded Civ Yor Collective who has intelligence 65
Debug Message:  Loaded Civ Drath Legion who has intelligence 65
Debug Message:  Loaded Civ Drengin Empire who has intelligence 65
Debug Message:  Loaded Civ Dominion of Korx who has intelligence 65
Debug Message:  Loading player civ Anunaki
Debug Message:  Loaded Civ Dark Yor who has intelligence 76
Debug Message:  Loaded Civ Pirates who has intelligence 1
Debug Message:  Loading Colonies
Debug Message:  Loading RallyPoints
Debug Message:  Loading Ships
Debug Message:  Loading Fleets
Debug Message:  Loading Turn Event Log
Debug Message:  Loading Treaties
Debug Message:  Loading ENDGALAXYDATA
Debug Message:  Updating ZOC.
Debug Message:  UIBeginGame called with g_ulLocalPlayerID = 9
Debug Message:  UIBeginGameHelper: New Game Started
Debug Message:  UIBeginGameHelper: Mods are Disabled
Debug Message:  WM_CLOSE message received.
Debug Message:  GameUninitialize start
Debug Message:  Killing Galaxy
Debug Message:  Killing threads.
Debug Message:  Kiling civs.
Debug Message:  Killing ships.
Debug Message:  Killing rallypoints.
Debug Message:  Killing misc objects.
Debug Message:  Killing stars.
Debug Message:  Killing anomalies.
Debug Message:  Killing asteroid fields.
Debug Message:  Killing asteroid field mining bases.
Debug Message:  Killing space resources.
Debug Message:  Killing ascension crystals.
Debug Message:  Killing colonies and planets.
Debug Message:  killing scenario.
Debug Message:  Clearing Turn Event Log
Debug Message:  Clear galaxy settings.
Debug Message:  Clear influence.
Debug Message:  Clear up laws.
Debug Message:  Clear first time events.
Debug Message:  Clear wonders and trade goods.
Debug Message:  Clear sector mapper.
Debug Message:  Clear data definitions.
Debug Message:  Killing ship styles:
Debug Message:  Killing Galaxy: Completed
Debug Message:  Shutting down sound system.
Debug Message:  Clearing sound and music handles.
Debug Message:  Desplay_Scroll_Small_Tab.png not cleared 2 counts left.
Debug Message:  TextFiledBack.png not cleared 1 counts left.
Debug Message:  WorkAreaBack.png not cleared 1 counts left.
Debug Message:  GameUninitialize end
Debug Message:  Device not cleared. 328 counts left.
Debug Message:  D3D not cleared. 1 counts left.
Debug Message:  Destroying Window.
Debug Message:  Main Shell terminating normally

Definitely update your drivers. I vaguely recall there being issues with minimap rendering performance when Microsoft killed off GDI acceleration with Vista's launch (and your divers date from about a month after that).