I guess it's funny in a way.
CariElf details how to post a bug report, then 4 (so-called) bug reports that don't follow her instructions. (even after 3 years since the OP)
No debug.err info in any of them. And it seems many do not do a search for similar problems to find the solution.
Wardchap, update your AMD CPU drivers. It will solve your problem.
Clarre77, you don't have a bug. You have a lack of knowledge.
RainerPlaumann, you have not mentioned a bug at all. Just a general lack of knowledge as well. Keep your approval rating as high as possible, and you will have the best possible population growth for your approval rating. 80-100% is best.
If you have a problem, start a thread and post the relevant details (including the debug.err info!!!). There are many people here that will help. In WinXP the debug.err is located in "My Documents\My Games\GalCiv2" - if you have the latest version, otherwise look in the main game folder. The debug.err for versions other than the original GalCiv2 will be in their respective sub-folders.
Always use the debug.err file info just after a crash or problem, as the game begins a new one each time you start the game.