Norton 2006 is highly outdated. It is unable to provide protection against some of the latest nasties. Plus, the new version runs much lighter on the PC. I urge you to upgrade as soon as you can.

To move to the new version, be sure to have the new version readily available. Then disconnect from the web, uninstall the old version and reboot. Then install the new version. Once it's installed, you can reconnect to the web.