Actually, I found an article that MS is not the only one to blame for the viruses & spyware existing in windows... it's really the dumb users that are running it. It's a "click-happy" environment were everyone runs as administrator and so programs can get full access to the computer. Now if everyone ran something like Ubuntu, I think the OS world would be much safer!
I concede Xbox'z point. also macace. While i do feel that windows is the most user friendly environment for a newbie