Windows 7 blinks on a iMac i7 with ATI Radeon 4850

Hi, just installed Win 7 in the iMac i7 and it doesn't stop blinking. Says it has recovered from a driver error on a on. You can't use the SO.
Is there any solution? I've tried to install all kind of drivers (the ones with Windows Update, Catalyst and Boot Camp ones) and it doesn't work.
Thanks

Maybe it will help 'cause I had a similar problem but with an nvidia gt120 card..
just see this thread:
http://discussions.apple.com/thread.jspa?threadID=2300385

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    Message was edited by: francis.t

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