It seems that you might have too many files (maps) in your C:\Program Files\Call of Duty, and C:\Program Files\Call of Duty\main, and C:\Program Files\Call of Duty\uo directories.
Get this COD multi-fixer program
http://callofduty.filefront.com/file/CoD_MultiFixer;67336Run this program and tell it to clean your COD and CODUO games.
See if your game works fine again.
You may also have to delete some of the mod folders in your C:\Program Files\Call of Duty\main and C:\Program Files\Call of Duty\uo directories. You may have too many different mod folders there.
I hope this helps.
Where are you? I want to say hello to you in your language and do not know if that should be Guten Tag, Bonjour, or something else. :-)