Bugger - as before, I get the following:

RGB1
Signal Error
H 64KHZ P: V 60HZ P

:(

This should not happen... It sounds like a "standard vga" error. I would suggest a windows repair like the one I linked above...

Anyway, instead, why not boot Windoze normally and, now that you have BIOS set to "failsafe", try to run prime95 for a while and see if you still get errors...

HTH

Ok Paul - thanks for all your advice so far.

I'll post back tomorrow if it goes to plan - if not then I guess I'll be here before I know it!

I've just started the Torture Test and Task Manager reports that it is using 50% of the CPU and 1,475,536K of RAM, which is about 3/4 of my 2GB. (4 x 512MB) This sounds normal in a stress test - correct?

I don't know much about prime95, but the [U]blend test[/U] will stress your system the most, showing up any weaknesses...

50% because your computer is HT-enabled -- really like 100%. This is normal and you do not need to change anything.