I'm having the same problem, but my computer is preventing me from running malwarebytes or any other AV program.
Try downloading, installing, and updating malwarebytes in safe mode with networking. Most malware is dormant in safe mode with networking. It's more likely that you'll be able to download, install, and run your scan without intrusion from the malware. To access safe mode with networking, press F8 on startup until you see the safe mode menu.