What graphics driver version are you using? Are you over clocking at all?
my driver version is 220.127.116.1128 that is the version for windows xp that came from CD. i tried already the auto-update center here, but the info says it is for vista/7 64bit so i can't update at all. and besides i haven't overclock anything.
now iv'e used the search/download center instead of driver update utility,
I updated my current Graphics version to 18.104.22.16825(latest) and then
my BIOS ver. to the latest version TCIBX10H.86A.0028.2009.1201.1520
the scenario doesn't cure anything at all, when playing Left4Dead the same result after an hour or less but it won't show BSOD anymore instead my Computer will Hang and really need to reset it.
GMA HD Graphics properties:
3D: Global Settings = balanced
Resolution: 1024x768 @ 75hz
aspect ratio: normal(4:3)
Resolution: 1024x768 full screen
LOW shader detail
LOW texture detail
LOW effect detail
HIGH page pool memory