Error 0x0000007f in Windows XP

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I got these pc specs:

ASUS A8N-E
Athlon64 3200+
1gb ddr400 corsair
Gainward gf6800gs 512mb gddr3
WD 160gb
Antec 500w PSU
XP SP2

I keep getting the following error: 0x0000007f (0x0000000d, 0x00000000, 0x00000000, 0x00000000), usually when I play. I have reinstalled windows about 3 weeks ago and from the first days it started giving me bsods', like 0x0000000 (showed error 51 in event viewer), which i got rid of when i replaced my page file, and some other erros that I don't remember and aren't appearing anymore now.

Few days ago I got 0x0000007f (0x0000000d, 0x00000000, 0x00000000, 0x00000000) error for the first time, and it happen when I was playing. I am getting it more and more often and now it appears even when i am not playing ... I read on the web that it could be from the sound drivers... I have installed Realtek WDM_A400 and still gives me the same error.

I have opened the last minidumps with WinDbg and it seems that ntoskrn.exe or ntkrnlpa.exe are causing the crash... I don't know what it could be and I am getting more pissed off because now I am getting that error more and more often, especially when I am playing. (I can't stay in a game more than 3 or 4 minutes)
I need to mention that I had no prob with the previous windows installation...

I have attached the last 4 minidumps I got, all of them happened today.
What could be the problem?


Regards,
George
 
Bugcheck 7f (d, 0, 0, 0) is usually a hardware error. Reduce or remove your overclock to see if things stabilize.
 
I have disabled overclocking and it seems to be working ok now ... But how could it happen?? My computer had the same CPU overclock the last 6 months and everything worked fine until this installation of windows.
I will be doing some tests later.
 
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