Sorry for the delay, our offices are closed on weekends.
If you are getting past the launcher, please open your debug.err file in notepad, and copy/paste the contents into a post here. This will give us some technical information that can help troubleshoot your problem. The location you'll find the debug.err in varies depending on which game you're playing:
Dread Lords: My Documents\My Games\GalCiv2
Dark Avatar: My Documents\My Games\GC2DarkAvatar
Twilight of the Arnor: My Documents\My Games\GC2TwilightArnor
Older versions may store the debug directly in the location the game is installed at.
If you are not even getting the launcher screen to come up, then it is likely an antivirus or ms-xml issue. In either case though the simplest solution is to just forget about the launcher, and change your shortcut to point directly at the game (GalCiv2.exe, GC2DarkAvatar.exe, or GC2TwilightoftheArnor.exe instead of GC2Launch/TALaunch).