The worst thought through feature in windows : windows update "restart now/later" dialog box. Why exactly did the need for this to steal focus and then have a keyboard shortcut for restart? Just to piss you off. I can't think of any other reason. Well, it works. Of course, Microsoft wants you to give in and restart your PC. No chance.
Heres how to disable the "Do you want to restart your computer now?" message:
Start -> Run -> gpedit.msc
Then select Local Computer Policy -> Computer Configuration -> Administrative Templates -> Windows Components -> Windows Update -> Re-prompt for restart with scheduled installations
and press DISABLE. Never again will you need to worry about that message. Unfortunately the effects aren't instant, so to get rid of the message now just disable the service.
Start -> Run -> sc stop wuauserv
Or go to Start -> Control Panel -> Administrative Tools -> Services
and disable it from there.
I think I did this update at 9 am, its now past midnight, so I've pressed the 'later' button about 60 times now.. oh so very annoying...