I have done what you suggested up until the point after I installed the updated ATI driver (8.911), once this was installed my system became impossible to use due to the PAGE_FAULT_IN_NONPAGED_AREA BSOD. This would happen every few minutes no matter what I was doing until it kept happening before I could put my password in at login, at that point I system restored from safe mode.
Just checked, there are no minidump files from during the unstable period after I performed the system restore
Should I still do the gfx card stress test? And any idea what the overall problem is?