Originally Posted by Cralor
The capitalization does not make a difference, actually.
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Some operating systems are case-sensitive. Windows, generally, is not, though.
OP: take wow out of your My Documents folder and put it in its own directory (C:\Games\World of Warcraft or even C:\World of Warcraft) or just back into Program Files (there won't be any security permissions issues because you're on XP). While WoW should work from anywhere (including your external hard drive or a thumb drive) just try moving it from that location to see if it helps.
First, though, do what Maul said. Make sure you don't have two copies of WoW installed.
Also, to expand on what nightcracker said, try changing some options in Interface Options, visiting the auction house, bank, etc.