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.    

Windows 2003 SBS

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:
Stop: 0x00000050
Boot from the UBCD and run Memtest 86+ to test memory. Let it run for at least 2 passes.

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!!  
Glad it's resolved and that I could help.
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