Hi. My computer freezes often while playing games or watching flash videos, sometimes i´m able to play for several hours sometimes only minutes. I done clean installs of win7 and new drivers but the problem is still there.
I would recomend testing components individually to narrow down to the hardware problem. I would say perhaps try removing your graphics card and using the onboard VGA and see if you still have the problem.
Are you overlocking your gfx card at all?