system hangs. Please help

OK, this is what happens:
I'm running Windows XP pro now for about half a year on this rig. Never had any kind of problem. Until the day before yesterday when the system started to hang (stops responding) at various random moments. It doesn't matter wich program is running. All I can do is using the reset switch but after that the system still boots up fine. I've checked the memory, did an extensive virus scan, even checked the PSU.... Oh, and I haven't installed any new programs for a long time now. everything seems to be fine. Still I experience frequent lockups.

Suggestions?

Thanks

I've checked the memory, did an extensive virus scan, even checked the PSU

Click to expand...

What did you use to check the PSU and the RAM, and what are your system specs?

what does your event log say? also, is it possible taht you have something in the background running that's causing the conflicts?

Sorry for the late reply guy's...

redduc900, I didnt' test the psu, I put in another one. No effect.
specs are:
Athlon XP 1500+
Stock heatsink & fan
shuttle AK32 mainboard
128 mb SDRAM
Geforce 4MX 440
Liteon CR-RW 40*12*48
no soundcard (MB used)
Windows XP pro sp 1


NotHisTechiness, checking as we speak

Thanks!