There are thousands of virus’s for Windows OS’s. How can you stay protected? What most virus’s do is that they multiply themselves and take personal data,passwords,files,or just slow down your computer. The main thins you can do is get AntiVirus. For FREE, I recommend Avira [ http://www.free-av.de/de/trialpay_download/1/avira_antivir_personal__free_antivirus.html ] . Avira is a personal AV program that overall does a great job. Also to give your PC a huge performance boost, I also would say you should get the free program gamebooster ( http://www.iobit.com/gamebooster.html ). This program shuts down useless services and proccesses to make your computer run outstandingly smooth for pc games.