Antivirus software is an essential tool in your identity protection toolbox and there's just too much personal information on your computer these days to risk even a day without online threat protection. This is why anyone with a Windows PC should install antivirus software on their machine the moment it's out of the box and should update that software regularly to stay ahead of emerging and evolving cyber risks. Even if you surf the web on a secure browser and use threat-detection software, it can be all too easy for an insidious program to wind up on your machine, and that can lead to chaos such as identity theft.