I'm a retired PC Tech, but I still get called out to fix computers all the time. It's mostly software related things, like spyware, trojans, etc.
AVG takes care of the real viruses and Spybot S&D takes care of most of the spyware, but when something goes beyond their ability to remove.....I call on "Malwarebytes". It's a great program for getting the last remaining parts of spyware like "My Web Search" out of your PC.
Good advise TorrentG!
Old Timer