In addition to keeping your anti-virus software updated, in the war against computer viruses, it is important to keep your operating system up to date with all the latest security patches. To update your Windows computer, visit http://windowsupdate.microsoft.com/ and following the instructions to Scan for Updates. For more specific information about the Blaster virus, try What You Should Know About the Blaster Worm and Symantec Security Response W32.Blaster.