Automatically download and install important security usability updates for Windows operating systems.

http://www.windowsupdate.com

Automatically download and install updates for all Microsoft Software including Office.

http://update.microsoft.com

Automatically download and install updates for Microsoft Office Suite.

http://officeupdate.microsoft.com

Manual updates to Apple software. For Automatic updates run Software Update from your Apple Menu.

http://www.apple.com/support/downloads/

Manual updates to Microsoft Office software for Apple computers.

http://www.microsoft.com/mac/downloads.aspx

Information and removal tools for computer viruses.

http://www.sarc.com

Free online virus scan and removal tool.

http://housecall.trendmicro.com