auto restarts

[DanOtunE]

Ok i am getting a Blue screen that come up vary randomly
and says :::

A problem has been detected and windows has been shut down
to prevent damage to your computer.

DRIVER_IRQL_NOT_LESS_OR_EQUAL

Technical Information :
*** Stop : 0x000000D1(0x71241FBE, 0x00000002, 0x00000000,
0xf7450134)

*** Portcls.sys - address F7450134 base at F744F000 Date
Stamp 3d6de2ca

Beginning Dump of Physical memory
Physical memory dump complete.

if I go to windows manage... and look at the recant errors
it says.
The computer has rebooted from a bugcheck. The bugcheck
was: 0x000000d1 (0x71241fbe, 0x00000002, 0x00000000,
0xf7450134). A dump was saved in:
C:\WINDOWS\Minidump\Mini091403-02.dmp.



My COMP SPECS


System Info Version: 2.2

Operating System: Microsoft Windows XP

Processor: AMD AMD Athlon(TM) XP 2000+ @ 1.67 GHz

Graphics Card: NVIDIA GeForce4 Ti 4200

Total Physical Memory: 1 GB

Free Physical Memory: 764.35 MB

Motherboard Manufacturer: ASUSTeK Computer INC.

Motherboard Model: A7V333

( I have tryed everything on this link
http://support.microsoft.com/default.aspx?scid=kb;en-
us;810093)

thx