|How old is this machine? |
How dusty is it inside?
Have you checked the CPU temperature (in the BIOS)?
How much RAM is installed?
What size is the CPU?
Are all drivers installed for the hardware in the machine?
Does it still freeze if you boot into Safe Mode?
You've given very little information, so all we can do is make wild guesses. Answer the above questions and we may be able to assist.
Please let us know if you found someone's advice to be helpful.