Updating your computer's operating system. - Article 1418

To update your Windows Operating System manually, using Internet Explorer, go to the web site: http://windowsupdate.microsoft.com and follow the online instructions.  You may have to restart your computer after the updates have installed.

For information on Microsoft Windows Automatic Updates, visit Microsoft's Update site.

To update your Mac OS, go to the Apple Menu and select Software Update and follow the instructions.  You may have to restart your computer after the updates have installed.

For information about scheduling Mac OS software updates, see http://support.apple.com/kb/ht1338