When he turns it on they all take turns scanning the computer... if they all scan at the same time their innate business espionage programming will identify each other as a virus and attempt to destroy the competition by deleting them..

so I guess he turns it on goes to work, comes back home and his computer is all ready for him..
I only use one thing... it's a trial of bitdefender.. (bitdefender.com). If you go to a website that tries to give you spyware, a little thing pops up bottom right of your screen that tells you it was blocked.. one time my desktop got hijacked (relatively new format too..

) I got bitdefender installed again and it destroyed that little hijacker within seconds..