Thanks for the quick replies.
Anyway, everything is running at stock speed - nothing is overclocked.
I ran memtestx86 for another 10 passes. No errors have come up. Also ran the system file check and no problems were found. The RAM is Corsair DDR3-1333 (PC3-10600) (2x2gb).
Current temperatures are (at idling)
AMD Phenom II X4 965: 31 degrees Celsius
Radeon 5770: 30.5 degrees Celsius
AMD Phenom II X4 965: 51 degrees
Radeon 5770: 77 degrees (Furmark)
So I don't think heat is the cause..especially since I can stress test my computer without any difficulty. Most of the Blue screens have occurred with minimal system load (e.g. MS Word, Foobar2000, Windows Live Messenger and Mozilla Firefox running).
The power supply is a Zalman ZM600-HP 600W ATX. This can supply 12VDC to the GPU. I'm not sure how to find out how much the GPU needs but I think that is enough?
Also, is it possibly a driver
issue? I was using a Netgear WG111v2 and this appears to have non-Windows 7 compatible drivers
(which I just realised). Seems like a shot in the dark though, but I'm running my desktop cut off from the net to see if it is the problem.