I am trying to help a friend. Her computer would hardly boot yesterday, but after 10 minutes or longer, it would load. Programs hardly run and if they do are impossibly slow to run. Windows task manager keeps popping up. It won't close. We tried to set the registry back to an earlier date, but it won't take. My guess is that is a virus. She had AVG anti-virus running now it won't run either. Any thoughts? Any reliable online site which could scan the computer?