Toshiba Laptop Freezes after 8-20 Minutes

As stated in the subject my laptop keeps freezing after 8-20 minutes of use.
It started doing that a couple of days ago.It is a Toshiba Satellite L645D-S402 with Windows 7.The weird thing is that when i am running avast's full scan it doesn't freeze.Help with this problem would be greatly appreciated.

Satellite L645D-S402
Maybe one of these?
Satellite L645D-S4025
Satellite L645D-S4029
Try these experiments.
What happens when you boot into Safe Mode?
Start your computer in safe mode
Also, what happens when you boot into another account. If necessary, create one.
Create a user account
-Jerry

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when I first "tested" this problem by squeezing the iBook in the area of the chip the display would come on, but if I squeezed a bit hard it sounded like the drive made a loud noise. Could the pressure affect the drive performance?
Yes, but if you had too much pressure there, the hard drive probably would make grinding noises, letting you know that something was amiss with it. If you squeezed too hard initially and heard those noises, you know what I mean.

Toshiba Laptop Freezes after 8-20 Minutes

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