I'm currently using Malwarebytes Pro but want to have Windows Defender on as well since MAMB isn't really an antivirus. They're supposed to be compatible but for some reason I can't turn on Windows Defender; I see the message "Your PC isn't being monitored because the app's service stopped. You should restart it now." When I visit the process list, I see that WinDefend is in the "Stopped" state, and when I turn it on it flashed on for less than a second before going back to "Stopped".
I've uninstalled Malwarebytes and removed anything related to it I can find (ProgramData, registry entries, etc.) but I still can't turn on Defender and get a timeout error any time I try to enable it. I've never tried to install any other antivirus so it's not possible that any remnants are conflicting. Additionally, Windows Update fails to install any Defender-related updates.
What can I do? I know I could just get a different AV but I'd like to get this working.