comp keeps shutting off

Hey hows it going.

i having a problem with my comp. Whenever i load programs, or plays vidoes, the comp will be fine, and then it will all of a sudden freeze and restart. i dont know why it does it.

if i leave it alone and dont touch it, the comp will stay on, and be fine.

but if i go on the interenet run prgrams, and it will take like 10 min it will freeze and restart.

why is this.

i tried reloading my OS sytems. I thinking its the ram, becuase it only happens when i active. waht do yall think. right now 512mb is intalled. do you think my ram is failing
 
Could be a few things... RAM could be a probably as you suggested. Here's a good program to test it...

http://www.memtest.org/

Just let it run overnight or something. Also, the power supply could be going bad, or any other hardware at that... It's really hard to just pinpoint the problem right off.
 
how do i exatly install this program.

i dont see where to download so i install it and use it.

or is it something i have to buy.

could u provide a specific link to download it and install it so i can use it.

thanks
 
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