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Malwarebytes performs well, uncovering many issues that standard antivirus software misses.
I was surprised by the first one as well; I recommend trying a different antivirus such as Avast (free).
It's completely free. Just use it with its free on-demand scanning and run a real-time antivirus constantly. I recommend Avast—it's also free. Occasionally perform a malware scan with Malwarebytes.
This happens because the built-in Microsoft antivirus isn't very effective, so switching to a free alternative like Avast works well.