How can I get my Mac free of malware?

Episode 1372 (55:32)

Randy from Lake Forest, CA
Apple MacBook Pro

Randy has been bit by malware and it won't disappear. Leo says Randy needs to just start over. He should just backup his data, then restart his computer, hold CMD + R, erase the hard drive and reinstall. He should get his data backed up first, though. It's really the safest way to fix his problem.