My desktop is crashing constantly...

Ok so i was recently helped with getting files off my desktop with a hard drive enclosure...i figured cleaning up the drive would stop the crashing. I also bought another fan for my computer and installed it after cleaning the inside of the computer. So, i have ruled out being a overheating problem... while i was cleaning up the disc a bit i scanned the hd from my laptop with AVG free edition. The bad news--it found 6 viruses. the worse news--i couldn't do anything about 4 of them from my laptop it seemed. The deal is that i'll start my computer and it will freeze after about 5 minutes. It did last for about 10 for the first time after cleaning up and installing the fan but now it's back to the 1-5 minute time. With such little time i cannot run any programs to scan for the problems. I was wondering if maybe i should reformat the computer and if so...how do i do that? If not what else could i do!?!?! any kind of help would be great...i'm beginning to get a bit frustrated with the whole ordeal.

 

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