everest is the program you are thinking of....

but you say you are running 5 fans in your case? and one gig of ram, and a 200 gig harddrive? ......350 watts is way to low to power all of these items.....i would suggest diconnecting all fans but your CPU fan and try it like that.....if it seems stable, try connecting the CPU fan as well....keep connecting your fans until you reach the level at wich your computer acts up again

this might not be the problem, but it's a good troubleshooting start