Windows Vista BSOD

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For the last two plus weeks my system has been rebooting after encountering a WIndows Vista BSOD. I have attached the full Microsoft debug file. I have run the Microsoft debug tool. Follwoing are the first few lines of the debug:

DRIVER_POWER_STATE_FAILURE (9f)
A driver is causing an inconsistent power state.
Arguments:
Arg1: 00000003, A device object has been blocking an Irp for too long a time
Arg2: 8840c5e0, Physical Device Object of the stack
Arg3: 88010030, Functional Device Object of the stack
Arg4: 8684bd70, The blocked IRP

Debugging Details:
------------------

Page 99373 not present in the dump file. Type ".hh dbgerr004" for details

DRVPOWERSTATE_SUBCODE: 3

DEVICE_OBJECT: 8840c5e0

DRIVER_OBJECT: 854ebf38

IMAGE_NAME: sbp2port.sys

DEBUG_FLR_IMAGE_TIMESTAMP: 458761e1

MODULE_NAME: sbp2port

FAULTING_MODULE: 82400000 sbp2port

DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT

BUGCHECK_STR: 0x9F

PROCESS_NAME: ccSvcHst.exe

CURRENT_IRQL: 2

LAST_CONTROL_TRANSFER: from 81c4af7c to 81cd8569

I have followed the suggested Microsoft fix of adding a LegacyFlags configuration in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\SBP2. This did not solve the problem that is apparently being caused by my external WD My Book Pro drive. Does anyone have any suggestions on fixing the problem I am experiencing?
 
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