Computer keeps restarting! HELP!

[Munchie]

right, got a new pc, kept rebooting...took it in for repair and it needed more fans and that....worked ok for about 2mins haha, it keeps coming up with the following link after it restarts by itself....
http://oca.microsoft.com/en/response.aspx?SGD=17368c2a-3fc3-4a1f-a223-52204086bd4e&SID=10

can anybody help?or ave any software to test me pc or watever? cant even play media player for more than 5mins before the comp restarts!!!

its defo not RAM, hard drives, graphics card.....any ideas people?

 

[Munchie]

also cannot use software on me pc for long either...comes up with "encountered a problem and needs to close.sorry for the inconvenice"

 

[Counter-Strike]

Do a complete re-format of XP and see how it works...