My computer keeps freezing and making buzzing sound

I have a problem with my pc and i can not figure out what it could be.

The computer freezes at almost anything I do. It freezes when i am on youtube or even if have just longed onto STWOR. It keeps happening.Also it makes a noise that does not come from the machine but from the speakers or headset.
I am going to give you now the list of Operation system and speck.

Windows 7 Ultimate x64
Intel(R)Core(TM)2 Quad CPU Q9450 @2.66GHz 6.27GHz
4.00 GB ram
AMD Radeon HD 6800 Series

the only programes i run on this pc are games and some office software such as works and excel. etc

As you might notice i am not a person that knows much about pc's i love playing games in my free time but have never really bothered to look into the tech of it. I bought this pc of a friend and it worked fine for a few month and then this problem started.

thank you for the help and Godspeed.

only the one that knows knows the rest just say they know.
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More about computer freezing making buzzing sound
  1. Have you monitored the temperatures before it freezes? If not, I recommend downloading HWMonitor or Speccy to check the temperatures. This sounds like a similar problem I have on a laptop that also has a problem with overheating.
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