Bootcamp display problems - aluminium iMac

Hi
I have an aluminium iMac and I have recently installed windows on it. Everything went fine but there seems to be a problem with the display driver?
What happens is that when I'm doing something, the computer seems to freeze (music lags) then the display goes black and the computer runs as normal (the music starts playing normally again.)
I thought it was only when I was playing Counter Strike Source but it happens when I'm not too. Is anyone else experiencing this? Any fixes/ suggestions?
I've tried repairing bootcamp drivers but to no avail.
Thanks

I was having Display Problems on my Intel 20" iMac- weird artifacts, lines, distortion of parts of the screen, weird color patterns, etc... all seemed to happen mostly during viewing video on the computer.
I worried that it was the card itself, and after about 4-5 years of use, was simply going bad-- and some articles and posts I found online seemed to confirm that this was possible--
I kept reading and eventually found posts about using smcFanControl to raise the fan rpm manually to try to keep things cooler in there... It seemed to work somewhat but not really, and the artifacts would continue and the computer itself was hot. The temp was usually constantly around 145F with lots of artifacts and distortion. When it wasn't running video or being used a lot, it would cool down and the artifacts would wane.
I found a step by step guide on ifixit.com to opening the iMac body to replace various components, etc. so I got the bright idea of opening it and blowing it out with compressed air.
It wasn't that hard to open and the guide was easy to follow, I went as far as removing the screen, which exposed one side of the guts and the fans. I blew it all out, it was dusty in there, and a lot of dust came out.
I put it all back and am running a netflix movie- temp is staying at about 125 +- and there are no artifacts...!!
I think I might have actually fixed it-- If you have a mac that is running hot and has weird screen artifacts, behavior, etc... I suggest dusting it and blowing out vents, fans, etc to allow it to run cooler....
Oh, My computer is way out of warranty, and I don't have AppleCare, and everything is backed up, etc... open at your own risk, knowing you will probably void any warranty.

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