Cannot install SQL Srv 2005 Service Pack 2 (KB 921896) / uninstall SQL Srv 2005

I tried to uninstall SQL Server 2005 and it was failed.

I tried to install SP2 for SQL Server 2005, and it was failed too!

Here are the log file SUMMARY.TXT (is it enough?).

Can anyone tell me what the problem is?

Time: 05/17/2007 16:51:41.483
KB Number: KB921896
Machine: XXXXXX
OS Version: Microsoft Windows Server 2003 family, Enterprise Edition Service Pack 1 (Build 3790)
Package Language: 1033 (ENU)
Package Platform: x86
Package SP Level: 2
Package Version: 3042
Command-line parameters specified:
/quiet
/allinstances
Cluster Installation: No

**********************************************************************************
Prerequisites Check & Status
SQLSupport: Passed

**********************************************************************************
Products Detected Language Level Patch Level Platform Edition
Express Database Services (SQLEXPRESS) ENU RTM 2005.090.1399.00 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): 1399
Product Version (Final) :
Status : Failure
Log File : D:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Hotfix\SQL9Express_Hotfix_KB921896_SQLEXPR.EXE
SQL Express Features : SQL_Data_Files,SQL_Engine,SQL_Replication,SQL_SharedTools
Error Number : 1332
Error Description : *** Shared String ID 1332 Not Found ***
-

**********************************************************************************
Summary
One or more products failed to install, see above for details
Exit Code Returned: 1332

From the log, it looks like you have two instances of SQL 2005 on your machine, one instance of Standard Edition (instance name of MSSQLSERVER) and one instance of Express (instance name of SQLEXPRESS). The SP2 installer will only apply to your Standard edition and not to the Express edition. Try to run the SP2 installer and only select the Standard edition components. To upgrade your Express edition, use this package:

http://www.microsoft.com/downloads/details.aspx?familyid=31711d5d-725c-4afa-9d65-e4465cdff1e7&displaylang=en

Thanks,
Sam Lester (MSFT)