So click on the image here and you can link out to the download page on the Microsoft website and update your Windows PC's defense system today.
Microsoft notes that it is important that you also have an active antivirus program to catch spam and devious hooks that can be delivered through web browsers and email.
I use AVG's free version of antivirus software. I have been using it for many years on various versions of Windows operating system. You can find their download page here.