One of my biggest Windows pet peeves is the Restart Now/Restart Later nag box that pops up after your install a patch from Windows Update. Yes, Windows, I know there's a reason I shouldn't wait too long to reboot but there's absolutely no reason I should be reminded of it every 10 minutes. Fortunately, there seems to be a solution, at least for folks with SP2. Using the Group Policy editor you can change the time between nags from 10 minutes to something more reasonable like, say, an hour, or get rid of them entirely. To learn how to do it, head over to The Code Project's forum, where a user called Daniel Turini describes the tweak.

Additionally, if you just want a temporary fix (or don't have SP2), stopping the Automatic Updates service will make the nags go away. Just go to Start > Run and type net stop wuauserv. Once you eventually reboot, the Automatic Updates service will start again by itself.