This is the understatement of the century....
I was conned originally to buy Norton, with my first pc, by some pimple faced little dork at Dixon's...
Within 3 months, I had collected 346 viruses, worms, with husbands and wives...Norton Didn't get rid of any of them...
But managed to provide a fertile breeding ground...
So my son got the pc in safe mode, deleted Norton and installed AVG free edition........... 35 minutes later the pc was as clean as a whistle.
At the moment, I am using AVAST, again the free edition... Marvellous program, and not as intrusive as AVG