Malware Defense is a rogue security program, designed to look like legitimate security software. If Malware Defense has been installed on your PC more than likely you did not intentionally download it, it just appeared one day.
Malware Defense usually infects a computer system with help from malicious advertising or a trojan found on a shady website. Malware Defense usually infects unsuspecting users PC’s without permission. Malware Defense is a scam, do not buy this software, it should be removed from infected computers immediately.