Restart a MS Server 2008, without it installing updates?

How do I prevent my Microsoft Server 2008 and SBS 2008 from installing updates when I restart them, occasionally I need to quickly restart them for some software install to take place, but I dont want to have to wait hours for updates to be installed.

Update We schedule reboots for server updates, but sometimes I need it to simply reboot, nothing more.

Solution 1:

Use the shutdown command:

shutdown /r /t 0

Solution 2:

Totally not answering your question, but just giving some good advice. Stop all Exchange services before shutting down or rebooting...You'll be shocked how much it speeds things up (Take your normal 15 minute reboot down to 5 minutes)