My PC keeps freezing every few seconds for a second or two

Hi, hope someone can help, for some or other reason my pc keeps freezing every few seconds for a second or two.

My system spec is as follows, i7 960, 24gb ram, geforce gtx 465, corsair h60 cooling, x2 tb hdd, 1000 watt power supply, asus p6t motherboard, wireless network card. Running windows 7 ultimate.

The software i have is Win 7, office 2010, avast anti virus, and a couple of small apps.

I have tested all components and everything is working.

The computer would freeze while i am gaming, watching a movie etc, after a while it goes away for a minute or two but then starts all over again. If i reboot the pc, it sometimes sorts it out for a while but then it will start again.

I have formatted my pc a couple of times hoping it would be fixed, but alas it starts all over again.
 
1000 watt power supply is more than enough to run my current system, i have tested the power supply in another machine and its fine, i took my brothers 900 watt, installed it in my machine same problem
 
My whole system is standard, not overclocking at all and never overclocked. What are the chances of it being a wirless card problem.
 
"What are the chances of it being a wireless card problem?...

Why do you ask? I suppose it could contribute to the freezing
 
I am having the same problem, the culprit is apparently avast, try turning off P2P Protection, helped for me but didnt solve it completely.
 
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