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#11
The general consensus after expert testing is that Kaspersky is at or next to the top and Defender at or near the bottom w.r.t. effectiveness. Check it out for yourself.
I will NEVER use a computer on the Internet without Kaspersky.
You can do what you want, but I strongly advise all others to check with the experts before trusting Defender as their sole reliable and highly effective anti-virus defense (of course Kaspersky does more than just anti-virus)
I have Defender make automatic periodic scans only ::)
Microsoft Windows Defender Security Center - Microsoft Windows Defender 4.9
Eugene Kaspersky vs. Windows Defender: the Antivirus War of 2017
Is Windows Defender actually as good as everyone says? : buildapc
What’s the Best Antivirus for Windows 10? (Is Windows Defender Good Enough?)