KB948109 fails with errorcode 0×80070643

Having trouble getting KB948109 installed?  I did.  It was caused by some SQL Server services which I never use and had put to Disabled.  Put them to Manual or Automatic.  Then the update will install fine.

Here’s the full error description from the System Event Log:

Installatiefout: de volgende update kan niet worden geïnstalleerd, foutcode 0×80070643: Security Update for SQL Server 2005 Service Pack 2 (KB948109).

This was on my home PC, running XP Home Edition NL (which explains the Dutch in the error msg) and SQL Server 2005 Express SP2.