Monitor the security state of your workstation, and update it regularly to help prevent newly discovered vulnerabilities from being exploited. In addition to using Windows Update, subscribe to the Microsoft Security Notification Service, at http://register.microsoft.com/subscription/subscribeme.asp?ID=135 , to register for regular e-mail bulletins that notify you of new fixes and updates.
You can also use the "Hotfix & Security Bulletin Service," at http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/current.asp , on the TechNet Web site. This allows you to view the security bulletins that are available for your system.