1. Open Norton/Symantec Antivirus.
2. At the top of the Norton/Symantec Antivirus box, choose "File" and then
"Live Update"
3. The "Live Update" box should look something like this. When it
appears, click on the button labeled "Next" at the bottom of the box.
4. The virus definition update will now begin.
Follow the on screen instructions from here (mostly by clicking Next).