Im having the same problem.

If I reset my computer a few times it will eventually play at the correct speed, but its a major pain in the ***. In my case, the files are being played with Windows Media Player. I've been told that its probably a problem with a codec, but I have no idea how to fix it. Any help is GREATLY appreciated.
Thanks,
Mr Greenbuds
edit: i just realized how old this thread was, lol. probably no help here eh.