random crashes

[gwyn]

hi all
iv been having some random crashes on my pc.
iv run memtest for about 2 hours with no problems
I then ran prime95 for about the same time and it would'nt finish test 1. It did'nt find any errors it just did'nt go on to test 2.
please help

 

[gwyn]

sorry here is my spec
Mobile XP 2500+ 200/11 @2.31 vcore 1.7
Abit NF7-S v 2.0
WD120 caviar 7200RPM
1 gig Crucial PC3200
BBA 9800 Pro
Antec trueblue 480