Malwarebytes is a perfect FREE programme that will get rid of those nasty viruses and adware. Once downloaded and installed, you can quick scan your pc and I'm sure that at least a few results will show. I used to have nortan anti virus, that slowed my pc down so i replaced that with avast (great product!) but i know what websites are safe and not. I use the professional version of Malwarebytes because it has 24/7 live protection including website blocker and ip blocker.
I strongly advise anyone to at least try this programme. It is used by profesionals and they would all advise you to.