You thought having an antivirus system is enough? Wrong!
Most antivirus systems these days barely stop all of the malicious (bad&nasty) software which is floating in the big river called Internet, such as, but not limited to, trojans, rats, worms, tracking cookies, malware, spam and so on.
Yes, there are plenty of anti virus and anti-malware and anti-whatever, and I’ve tried most of the well known ones. I usually test a dozen of different security enhancing apps each year and these are the ones that you MUST have. And the best part? They are all free (ofc. they have a payed version)! And they are: