Operator error is probably the most cases that I have seen as far as viruses and other software issues with windows, and at the same time, at this day and age, people want instant gratification. There is no such thing as a full proof OS and will never be as long as there's someone on the other side figuring out how to get around security, just because you have an antivirus program does not mean you can't get a virus, there's no guarantee, but that's what keeps me in business so I guess it's a good thing...