My system didn't shut down - Bug Check 0x9F

[aligahk06]

Dear All,
I'm using winows vista 32 bit O.S
Below is the problem while shutting down the system.
My system didn't shut down. I want my system shut Down But it didn't shut down.

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6002.2.2.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: 9f
BCP1: 00000003
BCP2: 85560030
BCP3: 86D16CF0
BCP4: 856FD0A0
OS Version: 6_0_6002
Service Pack: 2_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\Mini081310-01.dmp
C:\Users\FSN\AppData\Local\Temp\WER-11109954-0.sysdata.xml
C:\Users\FSN\AppData\Local\Temp\WER627D.tmp.versio n.txt

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Any help is deeply welcome.

[whs]

Here is a bit of info on this problem: Bug Check 0x9F: DRIVER_POWER_STATE_FAILURE