KB921896 fails to install - SQL expr. SP2

I fail to install KB 921896, SQL Express SP2. Here is the summary log. It
kicks out on a few machines I have,not just one particular one. Does anyone
have any information about this? Searching got me install failures with
different reasons. Thanks in advance.

Time: 03/15/2007 11:11:10.765
KB Number: KB921896
Machine: Edited
OS Version: Microsoft Windows XP Professional Service Pack 2 (Build 2600)
Package Language: 1033 (ENU)
Package Platform: x86
Package SP Level: 2
Package Version: 3042
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
Express Database Services (SQLEXPRESS) ENU SP1 2005.090.2047.00
x86 EXPRESS
Express Database Services (SQLExpress) ENU SP2
x86 EXPRESS

**********************************************************************************
Products Disqualified & Reason
Product Reason

**********************************************************************************
Processes Locking Files
Process Name Feature Type User Name
PID

**********************************************************************************
Product Installation Status
Product : Express Database Services (SQLEXPRESS)
Product Version (Previous): 2047
Product Version (Final) :
Status : Failure
Log File : C:\Program Files\Microsoft SQL Server\90\Setup
Bootstrap\LOG\Hotfix\SQL9Express_Hotfix_KB921896_SQLEXPR.EXE
SQL Express Features : SQL_Data_Files,SQL_Engine,SQL_SharedTools
Error Number : -2146885628
Error Description : Unable to install Windows Installer MSI file
----------------------------------------------------------------------------------
Product : Express Database Services (SQLExpress)
Product Version (Previous):
Product Version (Final) : 3042
Status : Success
Log File : C:\Program Files\Microsoft SQL Server\90\Setup
Bootstrap\LOG\Hotfix\SQL9Express_Hotfix_KB921896_SQLEXPR.EXE
SQL Express Features : Client_Components
Error Number : 0
Error Description :
----------------------------------------------------------------------------------

**********************************************************************************
Summary
One or more products failed to install, see above for details
Exit Code Returned: -2146885628