There are 2 variants of MalwareBytes .. The free one, which you use just to fix issues. And the Paid one which I think does include an Antivirus as well. That said, you should not run 2 antivirus programs at the same time. On my laptop (toshiba) I disabled Windows Defender and use just Avast free version. My desktop also uses Avast free .. MalwareBytes is installed if I need to fix things, as is SpybotSD and SpywareBlaster, both of which just do immunization of bad sites. They do not need to be running to do this.