Anti-malware: Malwarebytes Free

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Admittedly, Malwarebytes’ free tier doesn’t do a huge amount—it’s not a preventative, it won’t steer you away from the seedier corners of the web, and it can’t do anything about zero-day malware threats, unless you pony up some cash. What it does, though, is precisely what you need it to: run it once you think you’ve fallen foul of some terrible malware threat, and it’ll kill that pesky infestation until it’s well and truly dead.