Windows Vista Security basics - Using Windows Security Center - Automatic updating ?

Windows can routinely check for updates for your computer and install them automatically. You can use Security Center to make sure Automatic updating is turned on. If updating is turned off, Security Center will display a notification and put a Security Center icon Picture of the red Security Center shield in the notification area. For more information about automatic updating, see Change how Windows installs or notifies you about updates and What are updates?

To turn on automatic updating
1. Open Security Center by clicking the Start button Picture of the Start button, clicking Control Panel, clicking Security, and then clicking Security Center.
2. Click Automatic updating, and then click Turn on now. Administrator permission required If you are prompted for an administrator password or confirmation, type the password or provide confirmation.