Run Symantec Antivirus LiveUpdate Check
Symantec AntiVirus should be configured to check for newer virus defintions on a daily basis. You can check for these updates manually at any time.
NOTE: These steps are written for College Enterprise (EN) Computers with Windows XP.
Run LiveUpdate Check
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Right Click on the Symantec AntiVirus Client icon (see below, looks like a Yellow Shield) in the lower right corner of the screen and then Left Click on the words Open Symantec AntiVirus.

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Click the LiveUpdate button. Click Next. Click Finish.
NOTE: If new defintions are downloaded, they will not take effect until you restart the computer!
Troubleshooting
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Error: "LU1814: LiveUpdate could not retrieve the update list"
http://service1.symantec.com/SUPPORT/sharedtech.nsf/pfdocs/2002082616293813
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Error: "LU1806 (or LU1816 or LU1817): LiveUpdate was not able to install any of the <number> updates that you selected . . . "
http://service1.symantec.com/SUPPORT/norton2008.nsf/0/c9bb3112671fd46a652573b300169c11?OpenDocument
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Error: "LU6004: LiveUpdate did not complete successfully"
http://service1.symantec.com/support/sharedtech.nsf/docid/2002072309360813