Computer shuts down while gaming (other comp)

It didn't do that the first 2 years i 3 yeas i built it. It is 4 yrs old
On my other comp while im gamming everything is just fine and dandy untill about a few min later it shuts down. i try to turn it back on but it shuts down in a few secs again. When it off for about 5min i turn it back on and check the bios. it says the cpu temp is 130 F and the MB temp is 77 F. i had a new asus video card before the latest but it burnt up and i got a cheaper one. Some times it cuts off while i am on the comp doing nothing.
My OS is xp
i have AMD anthlon64 1.8GHz
Geforce 2 MX 400 64MB
and 2 fans in it. one came installed on the case and the other is on the cpu.

Please tell me solution i wnat my games back. and it dose it with all my games (starcraft, warcraft 3, doom 3, Knights online, maple story, Elder scrolls 3)
 
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