Check over heating, checked power options ins control Panel. I changed my PSU a few days ago, but hey I got the more powerful one, so whats the deal with that. It has been three hours and its running fine. Maybe I should arrange for a new one.
Ali
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AMD Athlon XP 2100 @ 1.75 Ghz 
Gigabyte GA-7VA.XP VIA K400
1.25GB PC3200 System Ram
ChainTech GeForCe4 TI 4200 128MB
Creative SB Live! 5.1
2x WD Caviar 120GBs and -Rom1 Maxtor 40GB
LiteON 16x DVD-Rw
WindowsXP Professional-SP2 & Mandrake Linux