http://computerboom.blogspot.com/200...oot-after.html
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Win dows\WindowsUpdate\AU]
"NoAutoRebootWithLoggedOnUsers"=dword:00000001
If you wish to do it manually in the group policy editor (also useful if you wish to make it part of your domain policy), here's how:
Run gpedit.msc or the domain policy editor. Under Computer Configuration, browse to Administrative Templates -> Windows Components -> Windows Update. To help confuse you, Microsoft mixes allow and deny statementes, sometimes including double negatives to keep the number of MCSE's in demand artificially high. The option you seek is called "No auto-restart for scheduled Automatic Updates installations" - it's about half way down the list. Double click it and set it to Enabled. You're done!
This works on Windows 2000 SP3 and up, XP SP1, 2, 3 , Vista , and Windows Server 2003.
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