The free version of MalwareBytes does not allow to to scan your computer on a schedule. This can be overcome simply by creating a sceduled task in Task Scheduler using the following command line:
"C:\Program Files\Malwarebytes' Anti-Malware\mbam.exe" /runupdate /fullscanterminate
That's it! MalwareBytes will update and scan your computer on the schedule you set in Task Scheduler for this task. The paid version gives you the availability to scan and update on an schedule as well as to provide real time protection.