A few months ago, the default antivirus for this computer starting misbehaving, its service would get disabled frequently.
Yes it is an old OS, and its end of life is coming soon, but I have this desktop with plenty of software and configured to the way my family feels comfortable each with their own profile. But now that I installed AVG and run it for a couple of days, I am extremely happy with its detection capabilities and performance, as well as the set of features that it comes with (which by the way, I am not sure I am going to end up using them all). I had adopted Windows Security software as the default on all my Windows machines, because of the poor experience I had with other Antivirus software, especially around performance and overall experience (some would monopolize the CPU to the point of freezing it). I also wanted to try something different than the default Windows Security software on another Windows10 household laptop. I decided to give AVG a try mainly because I was having some issues with the old Windows Security Essentials software on my Windows 7 (yes Windows 7) desktop.