Malwarebytes is available as a free download,
www.malwarebytes.org
When installing the program on your PC, make sure you uncheck the box that enables the free trial of the Pro version.
The free version of the program doesn’t automatically download
new malware definitions, so you’ll need to do update it each time
you use it. Switch to the ‘Settings’ tab to tweak the behaviour of
the program, although the defaults should work for most people
