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Published on 12.07.07 by Brent Trahan

How-to Block a Windows Service Pack

This guide shows you how to stop a service pack from being installed automatically by Windows Update in Windows Vista (SP1), XP (SP3), and Server 2003 (SP2).

Service packs are usually installed automatically by Windows Update. Some people or businesses might want to hold off a little while and make sure it’s compatible before they install it on their computers.

This guide shows you how to add a registry entry to block Windows Update from automatically installing a service pack for up to 12 months.

Block a Service Pack

Note: You must be logged in as a user with Administrative rights to edit the registry.

Download and merge (run) this registry entry.

It adds a key called DoNotAllowSP with a value of 1 in the HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate tree of the registry.

To learn more about blocking service packs see Microsoft.

Unblock a Blocked Service Pack

Note: You must be logged in as a user with Administrative rights to edit the registry.

  1. Backup your registry.
  2. Type regedit in the Start Menu’s search box and then right-click regedit in the search results and select Run as administrator.
  3. Navigate to HK_LOCAL_MACHINE\Software\Policies\Microsoft\Windows in the left pane of the registry editor.

    block_sp1.PNG

  4. Delete the WindowsUpdate tree (folder) under Windows in the left pane of the registry editor by right-clicking it and selecting Delete.

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One Response to “How-to Block a Windows Service Pack”

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  1. Pim Uijttewaal says:

    > Delete the WindowsUpdate tree (folder) under Windows in the left pane of the registry editor by right-clicking it and selecting Delete.

    By advicing this, you just assume, the users don”t have any other settings under this tree setting? Users working with a corporate WSUS server have other policy settings as well, as there are the WSUS server name etc. :-)

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