My computer keeps freezing/restarting?

As said below,it could be overheating....but your computer has been running normally right? I mean if it's relatively new(seems like it's Vista+) I doubt a fan has failed.And is it a desktop or laptop?If it's a desktop,slide the side panel off and check all fans are running.Been said that you should clean out your fans....all my years I haven't seen often that a fan stopped running due to excess dust/dirt and I've seen insides of computers that were BLACK(LITERALLY BLACK with dust and fans were HEAVY with it but we're running fine for years.I mean when you blow compressed air black clouds go into the air and block out the light). Honestly,if it's Vista,could be the instability of the operating system.... But what I truly suspect is one of two things: 1:Your hardrive is failing. 2:Your power supply is failing. I would believe it's your hardrive.There's a program out there called Active SMART.You can get a 30 day trial to see if that's the case.Otherwise run some diagnostic tools for hardrives. If your hardrive is fine(assuming your using a desktop),suspect your power supply.Having a defective PSU can create lots of those problems you have.

Now, you can eliminate the possibe of virus. So I believe it due to a corrupt registry. http://www.keep-pc-clean.com/ visit that site and speed up your computer.

get hwmonitor and make sure your cpu and video card are running relatively cool. IE not over heating if they ARE , it means you need to reinstall your OS. backup first. if it is an overheating issue, clean out your fans and maybe attach a few new ones to help out

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