I installed malwarebytes couldn't get to load properly so I installed it and now may mac keeps restarting, any suggestions?

See if you can boot into Safe Mode. See if MalwareBytes can run. Safe Mode disables unnecessary drivers, Startup & Login items so if Safe Mode works, start by disabling Login items.

Also disconnect all external devices in case one of them is causing a problem.

As HWTech says...

Safe Boot from the HD, (holding Shift key down at startup), does the problem occur in Safe Mode?