Well that's a decent amount of running time without a freeze, but I am surprised. Keep us posted.
I just noticed that we both have the same BIOS: Phoenix Award v6.00PG. Infact your AIDA report suggests updating you AGP BIOS becuase it is old (2002). Mine is 2003 but gave no suggestion. I'll look into upgrading it. Jakg - do you have any tips on how to do it?
Could anyone else with this problem please post their BIOS make and version?
, I will sleep here at work. 
Slightly different to before, it froze for around 20-30 seconds then I got a BSOD. It said the file causing it was nv4_disp. The message said "problem with device/driver". Hmmm. :banghead:
. I think the reason I got error message while using right click desktop is that there are some missing files during Nvidia driver installation which are noticed on the last process you asked me to do: