Errore windows Update kb921896

Windows Update dice che c'è un aggiornamento importante da installare:

Microsoft sql Server 2005 Express Edition Service Pack 2 (KB 921896).

Però il sistema non riesce ad installare questo aggiornamento restituendomi
l'errore: 8004100F

Girando un pò sul forum ho visto che potrebbe essere utile inserire il
contenuto del file:
C:\Program Files\Microsoft SQL Server\90\Setup
Bootstrap\LOG\Hotfix\Summary.txt

Time: 12/30/2007 12:26:56.948
KB Number: KB921896
Machine: PC-GVAIO
OS Version: Home Edition (Build 6000)
Package Language: 1040 (ITA)
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) ITA SP2 2005.090.3042.00
x86 EXPRESS
Express Database Services (VAIO_VEDB) ITA SP1 2005.090.2047.00
x86 EXPRESS
Express Database Services (SQLExpress) ITA 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): 3042
Product Version (Final) :
Status : Non selezionato
Log File :
SQL Express Features : SQL_Data_Files,SQL_Engine,SQL_SharedTools
Error Number : 0
Error Description :
----------------------------------------------------------------------------------
Product : Express Database Services (VAIO_VEDB)
Product Version (Previous): 2047
Product Version (Final) :
Status : Errore
Log File : C:\Program Files\Microsoft SQL Server\90\Setup
Bootstrap\LOG\Hotfix\SQL9Express_Hotfix_KB921896_S QLEXPR_ITA.EXE
SQL Express Features : SQL_Data_Files,SQL_Engine,SQL_SharedTools
Error Number : -2147217393
Error Description : Impossibile installare il file MSI di Windows
Installer
----------------------------------------------------------------------------------
Product : Express Database Services (SQLExpress)
Product Version (Previous):
Product Version (Final) : 3042
Status : Operazione riuscita
Log File : C:\Program Files\Microsoft SQL Server\90\Setup
Bootstrap\LOG\Hotfix\SQL9Express_Hotfix_KB921896_S QLEXPR_ITA.EXE
SQL Express Features : Client_Components,Connectivity,SDK
Error Number : 0
Error Description :
----------------------------------------------------------------------------------

************************************************** ********************************
Summary
One or more products failed to install, see above for details
Exit Code Returned: -2147217393