My 'puter has been playing up lately so I swept it for viruses, trojans and all the other nasties with Norton AV. The result was a squeeky clean system.
As the problems continued, my confidence in Norton AV was wearing a bit thin - for example, the Auto Protect kept switching on and off at random. I used SpyBot but it found nothing untoward.
Still sceptical, I downloaded MacAfee AV and had a major result by locating 6 nasties
Ok, Spybot is a freebie. Fine, won't knock it!
But Norton costs and can't do the job!!!!
And yes, I updated before I ran it
There must be a moral here somewhere
GM