IObit Security 360
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Full user review
"Watch out with the choice of language!"
Seems to work efficiently to find threats (though it's impossible to tell if you don't have data from objective comparative tests done by experts).
Gave 15 false-positives because I used it in English language on a non-English copy of Windows. But it doesn't warn about this issue.
I prefer English-language versions of programs over the often badly-worded translations. But apparently the interface language of IObit Security 360 also determines some details of the threat database. Some of Windows' dll files are apparently language-specific, and they were flagged as spyware. When I scanned in the Windows language, the system was clean. I think the program should make clear that the selected language doesn't just apply to the user interface but also to the malware database!
Other than that, I like the functionality and the sparing use of resources. A full scan of my big Windows computer took about 2.5 hours, which is long, but I guess it can be done in the background while you are working. A quick scan remains within 15 minutes.