On first thoughts, to me this sounds like you have been infected with something. To start with, can you download, update the definitions and run Spybot S & D, Ad-Aware and Trojan Hunter. Also, can you run a thorough AV scan. If you don't currently have any anti-virus software installed, I recommend AVG Free which has good detection rates and is free !
After you have scanned your machine with the above programs, can you also download HijackThis and post the log it produces on here for us to look at.
If you could invest in a small desk fan and have it pointing at the case, then that would cool things down a little but I don't believe this to be your problem.
I'm moving this thread from CPU Help to Anti-Virus help as I think that's where the problem lies - however, if it turns out to be hardware related, I shall then move it onto the appropriate forum. Any issues with this, then don't hesitate to PM me.
The No Ma'am commandments:
1.) It is O.K. to call hooters 'knockers' and sometimes snack trays
2.) It is wrong to be French
3.) It is O.K. to put all bad people in a giant meat grinder
4.) Lawyers, see rule 3
5.) It is O.K. to drive a gas guzzler if it helps you get babes
6.) Everyone should car pool but me
7.) Bring back the word 'stewardesses'
8.) Synchronized swimming is not a sport
9.) Mud wrestling is a sport