Are you talking about Norton Antivirus or the rogue anti-spyware program Antivirus 360? Antivirus 360 is not a good program! You should read here http://www.spyware-techie.com/antivirus-360-removal-guide/ and remove it right away!
Drop the whole Antivirus 360 thing altogether, there's a good reason for that. Antivirus 360 is a so called rogue security program, which essentially means it's a fake virus remover, which fools users into buying it by displaying fake threat reports. You can remove it according to these instructions: http://www.2-viruses.com/remove-antivirus-360
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Norton 360 is best at this time..
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There are a few ways you can do that. Like most rogues, it's best to remove Antivirus 360 manually: http://www.2-viruses.com/remove-antivirus-360 If that seems too difficult for you, you can try Spyware Doctor, found in the same site, or a combination of ComboFix and Malwarebytes' Anti-Malware