I am running:    ZoneAlarm Firewall (only 1 firewall enabled)  Avast! Free Edition  Malwarebytes Anti-Malware (paid edition, w/ real-time)    I am also using Firefox, with the WOT safety plugin.     Is this good security? Or can it be improved?

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I agree with with what Perfect said. I want add that it depends on what you want which the features of the above softwares must have guided you.