Server 2008 R2 BSOD on Dell T110 server

I have a new Dell T110 server with a new load of Server 2008 R2 that is restarting after blue screens a few times a day. Box has 1 quad core Xeon, and 12 GB RAM in it.
Bugcheck info :

Problem signature:
  Problem Event Name:      BlueScreen
  OS Version:      6.1.7600.
  Locale ID:      1033

Additional information about the problem:
  BCCode:      a
  BCP1:      0000000000000008
  BCP2:      0000000000000002
  BCP3:      0000000000000000
  BCP4:      FFFFF800014B6C53
  OS Version:      6_1_7600
  Service Pack:      0_0
  Product:      272_3


Reading elsewhere on EE about similar problems with other Dell servers, I have tried to flash the BIOS with the relevant program from Dell. The BIOS update program dies and rolls back, so no joy. "The instruction at 0x1002ed05 referenced memory at 0x1002ed05. The memory could not be read."

I've run hardware diagnostics from the Dell system partition, including the long version of the memory test. No errors found. I had this box running ESXi 4.0 at first, with no problems, but it was underpowered and i moved that to another machine. I tried disabling virtualization support in the BIOS (it was off by default) and disabling 'C states' under the processor settings.
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vmwarun - ArunCommented:
Are all your Hardware Drivers up-to-date ?
vmwarun - ArunCommented:
This tool will look at the memory dump log and find any possible culprits.

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John GriffithConsultantCommented:
Bugcheck 0xa is IRQL_NOT_LESS_OR_EQUAL = driver attempted to access pageable memory (or invalid memory) at a time that it should not have -- IRQL too high.
Please attach the mini kernel dump files - c:\windows\minidump
Run Driver Verifier -->
If 3rd party driver causing probems, D/V should flag it.
Regards. . .
jn2112Author Commented:
Thanks for all the responses!  
I have installed updated drivers today from Dell. And I'm running the driver verifier now. Driver verifier pegged a driver associated with Backup Exec Continuous Protection server. I'm going to see about removing it and go from there. This server was going to be my new backup server, sigh.  I wonder if I downgraded to R1 whether that would help matters.  I haven't placed it into production yet, so I can start over if i have to
jn2112Author Commented:
The experts helped me narrow down the problem quickly and accurately.  Thanks to all who responded!
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Windows Server 2008

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