Just look what you are downloading... (Score 1)

Very simple, if you are downloading a movie, download an .avi or .mpg. If you are downloading a game or a big software packet, download an .iso or any other cd-image. Ofcourse these files can be packed in .rar files, so simply open it with winrar. I never download .exe's, why? Because there are many diffrent ways to upload/download files. If you want to get an app, smaller than 75mb. Use LimeWire... That's my strategy, and I never got any problems relating spyware/virusses.