My boss somehow managed to get a virus on the PC its a persistent one and even survived reloading Windows. I looked up the popup his AVG antivuris gives and there are some articles about rootkit viruses. I have tried AVG's scan, Malwarebytes some sort of Sophos task killer and still cannot get rid of it. its causing browser redirects etc. I even reloaded the PC and it somehow remained. Is there anything else I can do.