VS 2005 SP1 Installation Problem

"The installation source for this product is not available."
I recently had to install VS 2005 SP1 on a Windows 2003 server that was hosting a development environment. After firing up the setup process I was presented with this error message on my screen;


Looking in the Event Log I also found this entry around the time the error message was generated;

Event Type:Error
Event Source:MsiInstaller
Event Category:None
Event ID:1008
Time:12:18:31 PM

The installation of C:DOCUME~1…LOCALS~1TempZNWA0VS80sp1-KB926601-X86-ENU.msp is not permitted due to an error in software restriction policy processing. The object cannot be trusted.

After doing a bit of research I came across others who had experienced the same problem and they directed me to this Knowledge Base artcile http://support.microsoft.com/default.aspx/kb/925336 which provided the solution. After applying the update and rebooting the server I was able to install the Service Pack.

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