Windows Tip: How to Disable Windows Update Restart Nag
Microsoft releases Windows updates and security patches regularly and when ever the system gets updated Windows puts up a nag screen that keeps on prompting you to restart the computer. In Windows the updates come into effect or some get installed during shutdown or restart only and hence it is necessary to restart the computer but this can get annoying if you are doing something really important and Windows keeps nagging for restart.
Windows XP Updates Restart Nag Screen

Windows Vista Updates Restart Nag Screen

How to Disable Windows Update Restart Nag
1. When you get the Windows update nag either in Windows Vista or Windows XP, open the command prompt by using the path StartMenu>Run>cmd or windows key + r and type cmd and then press enter.
2. In the Windows command prompt now type the below mentioned code:
sc stop wuauserv
3. Once you have put the above mentioned code and press enter and the Windows update service would be stopped and the nag screen will disappear. Windows update service will get restarted once you restart your computer hence you need not worry as your computer will keep receiving updates.
That’s it so now you can disable the Windows update restart nag whenever you are into something important.
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Nice find. Restarting windows after update was always irritating
This also works. It changes the amount of time it waits before nagging you, or turns off the nag. Arguably better because it will still check for an install updates, just not nag you to restart. I set mine to nag me every 24 hours so I don’t go too long without an important security update.
http://hubpages.com/hub/Disable_Restart_Prompt_After_Installing_Windows_Updates
yes cool, The nag (prompt) is absolutely unnecessary. The windows updates are very minor. Not that your restart your pc quickly after update and it will turn into a powerful machine
I make this code into a executable program. A cmd file, so any time I have a minor update I’m a click away from stopping the nag until I’m shutting down for the day. Just copy that code into notepad, with the save as type scroll box marked all files. Give it a name like wuauserv with a .cmd extension and save it. Now you’ve eliminated the process of finding the code (bookmarks), opening command prompt and typing the code. One click and the “program” does it for you