This is a moment when I would lose no time in clearing every scrap of Norton from my computer.
I would have to use all sorts of methods (after a Windows Add/Remove Software) and try to expunge every scrap left over in any part of the HD.
Finally I would download and install 3 free but excellent pieces of software - AVG for anti virus, Zone Alarm for a firewall (the free version not the Pro.) and Add-Aware, probably not so important but a comfort to use regularly in case something has slipped in.
I emphasise that this is a personal thing, but since doing this I have had neither malware nor a penny to pay for protection.