You can also edit the registry to disable Windows Update on a per user basis:
1.Start regedit.exe on the machine where you want to disable Windows Update.
2.Go to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer.
3.From the Edit menu, select New, DWORD value.
4.Enter a name of NoWindowsUpdate, and press Enter.
5.Double-click NoWindowsUpdate, and set it to 1.
Once you do this Export the key as a reg file and add it to your disk.
Someone else can suggest a way to lock permissions on that key (I know it can be done just not how)
Official MS Way!
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
How to back up and restore the registry in Windows
To turn off the Windows Update feature, follow these steps:
1.Click Start, click Run, type regedit in the Open box, and then click OK.
2.Locate the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
3.Right-click Image File Execution Options, point to New, and then click Key.
4.Type wupdmgr.exe to name the new subkey.
5.Right-click wupdmgr.exe, point to New, and then click String Value.
6.Type Debugger to name the new string value.
7.Double-click Debugger, type ntsd -- in the Value date box, and then click OK.
8.Quit Registry Editor.
After you follow these steps, you cannot click Windows Update in the Start menu or use the wupdmgr command to start Windows Update. However, you can still update Windows by visiting the following Microsoft Web site:
Edited by Kelsenellenelvian, 17 July 2012 - 03:09 AM.