Of course you should have installed both. Often anti virussoftware includes some spyware but I wouldn't depend on those features. Spybot S&D and Adaware are the most famous anti-spyware programs. Adware even identifies some trojan horses. You can download these programs here: http://www.safer-networking.org/en/download/index.html http://www.computerbase.de/downloads/software/online-sicherheit/ad-aware/ (You must only click the second link beneath Download Links - the first is a German language pack) You can get the best AV freeware tool here: http://www.free-av.com/