Do you have to shut down using the power button when the PC freezes?
If you do then turn it off, pull the cover off, and look for dust clogging up the 
works. Particularly in the processors heat sink and fan.
Clean it with a can of electronics cleaner (canned air).
After you're done, with the cover still off, fire it up and look for any non-functioning 
fans. Replace if necessary.
If it still freezes after all the above, then I would try updating all the drivers 
if possible and updating Windows itself.

Good luck!

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