Sounds like a thing for Corrine here...is she around here...?

Anyway, just to add I'd leave MBAM as it is for the moment as the virus may have disabled it. I rememebr the experts advice to rename MBAM to something else prior re-installation but I have not tested that yet in the newer versions. I use eset online scanner from time to time when needed also.

Perhaps you can try, for viruses I advise my friends (non-techy pals) to use:

Emsisoft Emergency Kit - EEK
Emsisoft | Emergency Kit: Free Portable Malware Scan and Removal

You will need a spare USB stick for EEK.

How to find and clean malware infections with Emsisoft Emergency Kit
How to find and clean malware infections with Emsisoft Emergency Kit | Emsisoft | Security Blog

Or use,

Zemana AntiMalware 2.74.2.150
Clean your computer in minutes with Zemana AntiMalware, no matter how badly infected!

Portable Zemana AntiMalware 2.74.2.150https://www.zemana.com/en-US/Download/AntiMalware/Portable/Zemana.AntiMalware.Portable.exe

Just download from the link above. Install and connect to the internet. Scan your system.

Do check your PM. I sent you something to help you.

Goodluck!