I am having the same problem and thought I'd input some extra little tidbits.
I have attempted with Team Fortress 2, Shattered Horizons, Aion and World of Warcraft to see if the problem would continue - the answer is yes.
My Asus ATI EAH4550 graphic card has recently had its drivers updated for this problem
My Motherboard - P5B has been upgraded to the latest bios, chipset and audio driver available on the asus website.
The game does not necessarily 'freeze' The video problem begins with the mouse ceasing to function, allowing video and keyboard inputs for a short period of time. Within a few seconds (Generally 5, tops 30) the keyboard controls become inoperative, at which point the video becomes static and frozen where it is. All throughout this problem, the ambient music plays, but no environmental sounds come through. All commands placed into the mouse/keyboard come through, but are not shown on the screen. I can type to guildies/players, what have you with no tearing or freezing in the text, but only a minute or so later will the entire game unfreeze, playing all environmental sounds at once and all mouse keyboard commands are spat out at the same time in sequence.
I have attempted the games through Steam, which causes the crash, wihout steam, which causes the crash (Aion/WoW) and tried while running Skype (Which crashes it as well). I had noticed this problem had happened once before when I was beta-testing windows 7 - where if the computer would enter suspend mode and you attempted to play an intensive game such as this, the mouse and keyboard would freeze, followed by the screen eventually.
Hopefully this can be fixed as I am an avid gamer and the whole reason for purchasing Windows 7 was to play Shattered Horizons with my friends. As I cannot even play a game over 5 years old (WoW) with equipment that is still considered powerful enough to run the Crysis 2 engine, I'm surprised this is a problem.
On that note however, the problem only started on the 9th of December, 2009. The night prior, I had allowed Windows 7 to download and install updated KB976325. The next day, all of my games were freezing. Perhaps it is a coincidence, I do not know, but I have uninstalled the update and the same problem is still happening. From my research however, update KB976325 does not uninstall properly.
If someone could re-install their Windows 7 and see if preventing the installation of Patch KB976325 would prevent this from happening, maybe we'd have a good starting point for troubleshooting for Microsoft.
Thank you for your time,
~Kiljax.