Windows Blue Screen with "Bad_Pool_Caller"

Hi everyone,

I really need some help here.    I've got a production server that was working fine this morning, but it got rebooted, and now it won't boot at all.    

Specs:
Windows 2003 SBS
ASUS A7V8X Mobo
2 SATA HDDs

Problem:
Right after the Windows 2003 logo (with the little bar at the bottom), just before it gets to a desktop, it Blue Screens.    
I CANNOT even get into Safe Mode!!    It blue screens even when tryinig to get into safe mode!
The only thing I can do is "Disable Automatic Restart on System Failure" so I can read the blue screen.
The error that comes up the most is:  Stop 0x000000C2   with a  BAD_POOL_CALLER

I have swapped video cards, but still no luck.

Since I can't even get into Safe Mode, I have no idea how to even troubleshoot this.
Please help.
Justin GooPresidentAsked:
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Justin GooPresidentAuthor Commented:
The other Blue Screen I sometimes get is:
NAV15EX.SYS
PAGE_FAULT_IN_NONPAGED_AREA
Stop: 0x00000050
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willcompCommented:
Boot from the UBCD and run Memtest 86+ to test memory. Let it run for at least 2 passes.
http://majorgeeks.com/Ultimate_Boot_CD_UBCD_d4981.html

Faulty memory is a common cause of such stop errors.
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Justin GooPresidentAuthor Commented:
Yep.   That did it.
Ran memtest.   Found a bad stick with a whole slew of errors.   Pulled it out, rebooted and I'm fine.

I was starting to panic. Thanks!!  
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willcompCommented:
Glad it's resolved and that I could help.
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