forced shutdown

tried to start up crossfire and it got to 1% and then a window poped up called "CF File Watcher" and it says "File was changed or forged. game will shut down by force." in these exact words and then i downloade it 4 more times from each mirror and it still says the same message.

My opperating syestem is a windows vista home premium.
Proccsesor: Intel(R) Core(TM)2 Duo CPU T5800 @2.00 GHz
Video card: I know my video card works with cross fire because i play cross fire every day
RAM: 3.00GB
Direct X Version: Newest version

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