rensolo..

If you're not satisfied with NIS, many of the members use the below A/V's. Whether you have the trial or full version installed, downloading and running the Norton Removal Tool, is recommended prior to installing a different A/V.

Avira AntiVir Personal - FREE
http://download.cnet.com/Avira-AntiVir-Personal-Free-Antivirus/3000-2239_4-10322935.html

Avast Free Antivirus
http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.html

If you're looking to replace Norton with another suite, I'm sure you'll get varying opinions from other members.

Best of luck..
Carol