Admittedly, I have no read through all the replies to this thread, but I wanted to say I've had trouble with this as well.
I'm running a Radeon 6770M on my three month old HP Pavilion dv7 with Win7 64-bit. There are very specific times that this error occurs for me. When I am playing a game (any game, save for The Sims 3) and press the alt+tab code to select a different window,
probably 7 times out of 10 the screen will blink, black out, and then that fun little bubble pops up telling me it's stopped responding and recovered. It's done this since I got it back in mid April.
For a period of time the problem stopped, and I thought it must have been something in one of my most recent windows updates. Then I started playing The Sims 3 and this problem happened at least once every 5 minutes, sometimes more than that (as in like
every minute or so), and I didn't have to be doing anything at all, and I could be sitting here minding my own business, staring listlessly, and it would blank out and then "recover". I seriously doubt it has anything to do with heat, my laptop is constantly
on a fan and right next to my AC unit. Since then, the problem alternates between mildly annoying to entirely infuriating, and I've downloaded all the driver updates I can think of to no avail.
I hope a solution for this is found soon, and though I doubt it, hope the details of my problem might
somehow be helpful.