Screen blackout running Windows 7 in Bootcamp

I've just upgraded to the latest Lion on my iMac 8,1 and the latest version of Bootcamp running Windows 7. Now I get random screen blackouts, which require a complete shutoff of the machine. I suspect it might be related to the new NVIDIA driver. Any thoughts?

I have a similar issue which first occurred today.  I was using Windows, and had been logged in for several days, when suddenly a relatively small blue box appeared in an otherwise black screen.  I didn't have time to read what appeared in it.  I started up in Windows afterward and the start up process seemed normal, i.e., all was visible in the OS and I could enter my password.  But, presumably after accepting the password, I only received a black screen.  This continued until I used the power button.  After briefly pressing the power button, I could see the mouse pointer and a spinning icon and the computer would then shutdown.  I hadn't been installing or updating any software in Mac OS or Windows before this incident.

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