I was just wondering if anyone else seems to have this problem as well, particularly with the GOTY edition, since I've asked all the people who've bought the game and the expansions separately and they told me that they've never had a problem like this before. So please, for anyone who has a bit of knowledge on this problem; can you help me? And thanks in advance if you tried helping me. Also, about the specific game files, I can't really tell you for sure, but most of them were .tga files.
It could be a bad install disc... usually you would get a CRC checksum error during the install. Also where in the game install to. I would avoid the Program Files directory (at least in Vista/7/8*) as the access right restriction may cause problem finding files.
Probably wouldn't work on Windows 8 preview, anyway.