Computer slowdown

3-10 seconds after playing a memory intensive game, like GTA 4, the computer slows down a lot. I tested the speed of the computer by scanning with Avast; it took about twice as long to scan a certain file right after I played this game. But, however, after 5 minutes or so, the computer speeds up to its normal speed.

I think that it's the hard drive that's causing this slow down because whenever the computer slows down, the hard drive whirs like crazy.

Here's the hard drive i bought:
http://www.newegg.com/Product/Product.aspx?Item=N82E16822144016

Could this be the Hard Drive slowing down? I've had this thing for over 2 years. Or, could it be the RAM or Processor?

Processor: AMD X4 Phenom II 940
RAM: 4GB 1066MHz
 
thats doesnt seam right, you've got high specs. though that drive isnt the best brand, just read some reviews. thats the 3.0ghz edition right?
 
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