BSOD on Shutdown!

[cmnewto]

Hi, I am getting BSOD on shut down only. I disabled auto restart to get error message (thinking it may be a bad dll), only info is:

(S?) RQL_NOT_LESS_OR_EQUAL
(*?) **STOP:0X0000000A (0X0000000, 0X0000001B, 0X0000001, 0X8202924B)

When restarting I get the following error info:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6000.2.0.0.256.6
Locale ID: 5129
Additional information about the problem:
BCCode: a
BCP1: 00000000
BCP2: 0000001B
BCP3: 00000001
BCP4: 8202924B
OS Version: 6_0_6000
Service Pack: 0_0
Product: 256_1
Files that help describe the problem:
C:\Users\Colin\AppData\Local\Temp\WERE85B.tmp.version.txt
C:\Users\Colin\AppData\Local\Temp\WER-95628-0.sysdata.xml
C:\Users\Colin\AppData\Local\Temp\WERE85B.tmp.version.txt
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Other things I've tried
Used Onecare registry cleaner
Updated drivers incl BIOS and Graphics
Ran spyware, malware and virus checks
Defraged and ran Dell system checks (all OK)

Help please!