Windows Server 2003: Windows update registry settings
Want to change the Windows Update settings on your Windows Server 2003 but the options are greyed out? You can change them in the registry.
Go to Start> Run> regedit
Go to HKLM> Software> Policies> Microsoft> Windows> WindowsUpdate> AU
To turn off Windows Updates completely, change NoAutoUpdate to 1.
To select one of the other 3 options change AUOptions to either 2, 3 or 4 (Notify=2, Download=3, Automatic=4).
Close and you’re done!