I built a computer for a friend a few months ago which has started to crash occasionally after being used for more than 3 or 4 hours. I thought it may be a C: drive hard disk problem and replaced it with a new one with no success and Speedfan confirms it is not a temperature problem.
Any ideas would be most welcome.
Asus P5B Mobo Intel Pentium Dual Core E2200 Asus 8400 GS Graphics OCZ 2 GB DDR2 800MHz RAM Seagate 160 GB SATA Hard drives (two - one for OS & Progs second for all data) Vista Home Premium
This is a screen shot of the screen when the computer crashes.