Tried using several antivirus for the past years (all free version) and some of the includes Avast, Avira, AVG, Kaspersky and they seemed to work fine but after a while, I don't think that they really do the job. My laptop became sluggish and scanning doesn't even help. Then a friend of mine recommended Malware Bytes and that's what I'm using right nowIt does the job and can really delete trojans and other harmful malwares.
What about you? What antivirus are you using?