system
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My bad, I forgot to tell that the steam one is a false alarm.
Also, I have run full scans before with avast and Spybot - Search and destroy. They gave no results.
Thanks for pointing out that Im not updated. Avast told me i was “up-to-date”, but I missed the “requier restart” 
And, immiedtly when I came back from restart, another one of these files got blocked…
I shall try the methond in your link. Should I do another scan, now that my antivirus is updated?