My computer got infected by a bad malware program (Antivirus IS) and a bad virus (unknown). I had McAfee Antivirus Plus and these virus and malware programs went right around McAfee even though I had real time scanning on. By the time that McAfee detected the danger it was too late. I had to have my hard drive wiped clean and reprogrammed. The repair shop added the free Malwarebytes program and I purchased the upgraded program. It scans with blinding speed and detects rogue programs that McAfee misses. One does need an antivirus program along with Malwarebytes. I know that new malware and viruses are concieved often and all of the antivirus and malware software can't offer 100% protection all of the time but I do feel confident with McAfee and Malwarebytes running realtime scanning.