HELP Laptop randomly freezes....

howdy all, i know this is probably answered in 50 different places but im looking for a quick answer.

first this first

sony viao running windows 7 home premium 32 bit
just got the work done at a store
I know your all going to say bring it back but i wanted to see if theres a quick fix i can do.
ummmmmmm, oh. originally came with vista, had 7 installed about a year ago, ran fine. had a root virus (or whatever the **** its called) got it wiped and a new 7 put on and now it freezes randomly. its not too hot there something wrong. if i had to guess it probably wasnt put on right but who knows. number for the comp is vgn-nw125j.

thanks for any help

any other info you need feel free to shout it out =)

* Go to search - type device manager and look for any yellow warning markers
* Download and run SuperAntiSpyware or Malwarebytes, a full scan after you update
* Run antivirus scan
* Check memory with memtest86
* Make sure that you are not over heating.
* Try in safe mode; report back if it works properly.
* Make sure PSU is working properly
* If overclocking, restore to original
* Test hard drive at company website.
*Type event viewer, in search (by start button) and look for errors that may show the cause of the problem.Look for critical errors (they have red in the left column ).
When you find them you want to look for critical errors that say app hang, app crash, or anything that relates to the problem.

thanks guys, the memory is ****ed up so im gonna have an earful for the guy at the store tomorrow, thanks for the help. gonna make me sound like i know what im talking about lol

Would you mind reporting back with the results please.
BTW wrong gender here.

ok the results.... when i got my computer worked on about a year ago ( i got my vista switched to 7).....who ever the asshole is ****ed around with it inside. and the screws were loose on the processor and harddrive and the gooey shit in the processor was bone dry (they said it was from being old/ slight over heating from time to time.) anywho after lubing/ tightening/ cleaning everything it runs like a top. all of those programs that everyone suggested worked great and all came up positive. the guys at the shop fixed the drive that wasnt reading as well. everything is awesome. thank you everyone who helped out!

Our pleasure.
Next time you have a problem you know where to seek help.