Your profile shows you registered a Metaverse character on the 20th - did you install over another version today? May have to do a complete uninstall/reinstall to corrct things.
Also, if you have a European version, there was a problem with the serial Numbers. Go here. https://www.galciv2.com/paradox/
Check out the sticky threads here for tips on those having downlaod/Install issues.
Finally, in the boxed version there are two serial numbers - one on the CD sleeve and one on a piece of paper. Make sure you are using the right one.
If all else fails contact Stardock support. They are very responsive. Best support I've ever had on a game.
Good Luck!