computer keeps crashing

Hello everyone, couple months back I posted some threads about my
computer that seems to crash and reboot only when I ran computer
games. Well I assumed it was a bad video card and had it returned to
newegg.com for a replacement. 2 weeks later I installed the same but
newer video card and to no avail.....the damm thing keeps crashing
while playing compter games. Later I did a full clean install of
windows xp....and still, no avail. Now when I run spybot.1.4 or my
virus scanner "AVast virus scanner", both applications seem to stop
after about 60% of scanning ..no crashing..just mysteriously stopping
and returning back to the desktop. I updated all drivers on the
motherboard and uninstalled/reinstalled new drivers for video card.
This is very strange since this computer was working fine for 2.5
months before the symtoms started occuring. I am now begining to think
that it is
1. a overheating CPU
2.a failing CPU
3. a faulty motherboard problem
4. a memory problem
5. a power supply problem
6. a driver problem

My comp specs are:

intel 3.8 GHz pentium 4
Foxconn P9657AA motherboard
two 80 Gig SATA II hard drives
Sapphire Radeon X1950XT 256mb
Seasonic 650watt ps
memorex dvdr/cdr burner
pair of kingston dual channel DDR2 memory (with heat sinks)
WinXp home sp2

ran memtest on memory for 8 hours and no errors were reported. I also
ran "fox one" and noticed that cpu temp went up to 57C when playing
"call of duty2" Is this somewhat high? I am doubting its the Power
supply since I payed 200 bucks for a top of the line power supply by
Seasonic. (but still, I cant verify this simply by brand name and
price.....How do you test PS's?) I am begining to gravitate towards a
overheating/ failing CPU or a failing motherboard component.
Any comments?

Ed

.

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