I think the detection of virus signatures is a failing strategy. I have seen computers that I know are infected and scanning with multiple products leaves some

I think the detection of virus signatures is a failing strategy. I have seen computers that I know are infected and scanning with multiple products leaves some of the bugs undetected. That said, it would be pretty stupid to run Windows today without a scanner. AVG and (believe it or not) Microsoft's Essential Security are good and free. The two major problems with virus scanners is that they bog the machine down. (AVG is starting to do this). The other problem, and I see this from all brands, they can detect a virus but cannot remove it. This is a serious problem today because it then requires an expensive tech visit to manually remove a virus.