Using an anti-malware program as an on-demand scanner is a safe way to get a second opinion. Just install it and occasionally launch it to perform a scan and check for the “potentially unwanted programs” almost no one actually wants. This version of Malwarebytes shouldn’t interfere with your antivirus program at all. Instead, it only does something when you launch it and click the Scan button.
In other words, it doesn’t run automatically in the background. The standard, free version of Malwarebytes Anti-Malware just functions as an on-demand scanner.
