Pookus, your problem is different and you should start your own thread.
Start a new thread and include your debug.err info.
It is located in C:\Program Files\Stardock\TotalGaming\GalCiv2 and can be opened with Notepad. Simply select everything, then copy and paste the contents into your post.
Just as info, if your computer is rebooting it is likely a driver or hardware problem. Your debug info should give a hint as to what is going on.