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Problems with Visual Studio 2005 SP1 on Windows 2003 Server

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Lately I tried to install VS 2005 Service Pack 1 on a Windows 2003 Server via Windows Update.

Unfortunately I ran into an error: Installation failed - 0x64C

After searching several forum threads I found out the simple solution for the problem - inserting the Visual Studio installation medium into the cd-drive before starting the installation.

"Wow - that was easy!" I thought, as I happily restarted the installation. But the story isn't finished yet!

I got another error, with only one different digit: 0x643!

The error is related to Windows 2003 Server - and this is the solution:

1) Open local security setting: Start -> Programs -> Administrative Tools -> Local Security Policy.

2) Click on "Software Restriction Policies" and if it shows "No Software Restriction Policies Defined" then insert a new (right click the left pane node).

3) 2 x click on the "Enforcement" entry and under "Apply software restriction policies to the following users:" section change to "All users except local administrators".

4) Maybe reboot (not necessary for me)

After that the Service Pack 1 installated withouth any further complaints!