Same problem here.
I was using:
SLI 8800 GTX
MSI NF750-G55
4GB G.Skill RAM
750watt PSU
Win 7 64-bit
Also, a 20 inch Veiwsonic monitor /non HD
with Ultra Aluminex Case
Then my monitor burned out and opted to do some upgrading and bought a Cooler Master HAF 932 case, a 24inch Viewsonic HD 1080P monitor with HDMI/DVI support, and a GTX 570 HD.
I started getting the error message a week after I installed the GTX 570 HD which was the last piece that I bought for my upgrading. I sent the card in for RMA thinking that was the issue but it was not. Also it doesn't happen with my 8800 GTX's. But when I
install my new card it does???
Also, it didn't happen until after I installed the latest Win 7 SP1? Hmm, but I also read that this has been going on for quite some time so I'm sure that is not the problem.