KB934458 Update SQL Server SP2 fails with Error Code 0x780

Contents of "Microsoft SQL Server\90\Setup Bootstrap\LOG\Hotfix\Summary.txt":


Time: 04/08/2007 10:04:54.671
KB Number: KB934458
Machine: *********
OS Version: Microsoft Windows XP Professional Service Pack 2 (Build 2600)
Package Language: 1033 (ENU)
Package Platform: x86
Package SP Level: 2
Package Version: 3054
Command-line parameters specified:
/quiet
/allinstances
Cluster Installation: No

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Prerequisites Check & Status
SQLSupport: Passed

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Products Detected Language Level Patch Level
Platform Edition
SQL Server Database Services 2005 (MSSQLSERVER) ENU SP2
2005.090.3042.00 x86 DEVELOPER
SQL Server Tools and Workstation Components 2005 ENU SP2
9.2.3050 x86 DEVELOPER

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Products Disqualified & Reason
Product Reason

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Processes Locking Files
Process Name Feature Type User Name
PID

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Product Installation Status
Product : SQL Server Database Services 2005 (MSSQLSERVER)
Product Version (Previous): 3042
Product Version (Final) :
Status : Failure
Log File : C:\EXE\Microsoft SQL Server\90\Setup
Bootstrap\LOG\Hotfix\SQL9_Hotfix_KB934458_sqlrun_s ql.msp.log
Error Number : 1920
Error Description : MSP Error: 1920 Service 'SQL Server VSS Writer'
(SQLWriter) failed to start. Verify that you have sufficient privileges to
start system services.
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Product : SQL Server Tools and Workstation Components 2005
Product Version (Previous): 3050
Product Version (Final) : 3054
Status : Success
Log File : C:\EXE\Microsoft SQL Server\90\Setup
Bootstrap\LOG\Hotfix\SQLTools9_Hotfix_KB934458_sql run_tools.msp.log
Error Number : 0
Error Description :
----------------------------------------------------------------------------------

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Summary
One or more products failed to install, see above for details
Exit Code Returned: 1920