IObit Security 360
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Full user review
"Fast scanning tool that finds what AVG and MSS missed."
Really easy to use in manual (freeware) mode. Fast scans and updates. Useful utilities. Not intended to be "core" antiviirus. Excellent as a tool for daily fast scans that take PC Security to a higher level than a stand alone antivirus could.
Hard to confirm its detections. It makes discoveries that surprise and scare you such as trojans inside freshly downloaded Microsoft Updates!
Requires less resources than Avast or Avira and those are pretty efficient too. Tolerates presence of other antivirus programs without any issues whatsoever. When used as a supplement tool with a full blown antivirus or security suite it is a stand out fast performer that makes no attempt to "hijack" the other AV product's position.