Question : SBS 2003 NT Backup SqlServerWriter Error 0x800423f4

Hi, I've recently installed some network license manager software on our SBS 2003 server, which had a pre-requisite install of SQL Server 2005 Express and the latest .NET framework etc.  ever since then I've been getting the below error message in my backup logs.  As this is crucial software I'd like to know if there's any hotfixes or other workable solutions than uninstalling.

Backup Status
Operation: Backup
Active backup destination: File
Media name: "01-03-2010_23.30.05differential.bkf created 03/01/2010 at 11:30 PM"

Volume shadow copy creation: Attempt 1.
"SqlServerWriter" has reported an error 0x800423f4. The backup may continue, but the data for this component will not be backed up correctly.
"MSDEWriter" has reported an error 0x800423f4. This is part of System State. The backup cannot continue.

Error returned while creating the volume shadow copy:800423f4
Aborting Backup.

Answer : SBS 2003 NT Backup SqlServerWriter Error 0x800423f4

There is a link in the sql 2005 server SP3 download to download the SQL 2005 server express SP3:
http://www.microsoft.com/downloads/details.aspx?FamilyID=ae7387c3-348c-4faa-8ae5-949fdfbe59c4&displaylang=en

I think the item you downloaded is actually the sql 2005 express with SP3 installer rather than an SP3 installer for sql 2005 express edition.
You should backup your Database before installing this sql 2005 express with SP3 applied.  This way once you install, you can restore the DB's if there is a problem from backup.

make sure you go through the advanced install configuration this way you can specify the location where the application files are stored and where to store the data files.
You can also here define the instance of the install.