What do you say you need a virus program on the laptop or not. Some of my friends say they have not had one for years and no problems others say you definitely need one.
Windows Defender is just a simple real-time scanner and can't compete with many antivirus programs, even though the program has improved in recent years.
If you pay a little attention is enough, but there are enough free antivirus programs are much better.
In any case.
I have been using Avira Antivir in a paid version for years.
The others may not even know that they have a virus.
Why can't it keep up? Because he has no web protection?
The Windows Defender is completely sufficient. I would recommend creating a Kaspersky Rescue USB Bootstick for emergencies. It works like this:
Install this tool: https://www.balena.io/...io/etcher/ Allows you to create bootable USB sticks from ISO and other image files.
Download Kaspersky Rescue Disk: https://support.kaspersky.com/de/viruses/krd2018 You will receive an ISO file.
Flash this ISO with the installed tool on a blank formatted USB stick.
Then boot the stick and scan your system.