Windows 2000 advacned rebboting from bugcheck is driving me crazy

I have a XEON box with dual CPU and 2 GB Ram which for the last two weeks has been rebooting almost every day by itself.
I already un-checked the Reboot automatically setting from all over the place.

In opening the memory.dmp I see the following:

*****
Kernel Version 2195 Free loaded @ ffffffff80400000
Bugcheck 000000d1 : 00000000 00000002 00000001 bfe25051
Stopped at an unexpected exception: code=80000003 addr=ffffffff80469e24
Hard coded breakpoint hit

******

I use PSTAT.EXE and I can't make up anything except that the Kernel loads at starting address:

  ModuleName Load Addr   Code    Data   Paged           LinkDate
------------------------------------------------------------------------------
ntoskrnl.exe 80400000  452288   99904  741760 Wed Feb 25 18:55:14 2004
     hal.dll 80062000   31808    8128   22048 Thu Mar 20 21:04:42 2003


Now I am not sure if addr=ffffffff80469e24 falls within the address where the kernel loads ??

If this is the case what do i do ?

If is not the case what do I do ?

I need help as I am at the end of my rope with this, any specialist willing to help I am paying for your time.

thanks