I have no idea why this information isn't better known. Free anti-virus programs are some of the best bargains I know of for Windows users, and yet many people have never heard of them.
First of all, every Windows computer needs an anti-virus program running at all times. If you are running a Windows computer right now without up-to-date anti-virus software, your system will become infected with a virus sooner or later. In fact, your PC may be infected right now without your knowledge. Yet there is a free and easy method of avoiding viruses.
If you already have an anti-virus program installed, there are several things you should know: