Random Restarts, no bsod

[jcwin7noob]

Hi,
Just installed windows 7 ultimate and I am experiencing random restarts.
There is no bsod, no freezing or anything, just monitor going blank and the computer restarts and boots. I heard something in a forum about a fan not working and the computer restarting to prevent damage, but as far as i can tell, psu, cpu and gpu fans are all spinning. Speed fan reports two temperatures as to high, something around 60-80 degrees. The restarts happen more frequently while i am playing 3d games like CS:S, but i also got a restart while playing solitaire...
any help would be great...
also, I activated win7 and it says it is genuine, but every couple days it comes up with, "Windows 7 will expire in 0 hours, please save your work etc..."

 

[Crispy]

60-80C is way too high for a CPU you ether need to consider aftermarket cooling or you need to clean your CPU heatsink.

 

[jcwin7noob]

Reinstalled with a disc acquired "differently" and it works fine, also a 'clean' version aka no bloatware **cough-ie-cough** preinstalled thanks anyway, no its a fairly new computer and i looked up the safe maximum temp for the cpu(intel) and its somewhere between 90-100 is the max safe. I thought that was dodgy but hey....