I would DL and use these in this order:

1-RKill -

http://www.bleepingcomputer.com/download/rkill/

make sure that you choose RKill. RKill means Root Kill and it works better than Malwarebytes root kill.

2-AdwCleaner -

http://www.bleepingcomputer.com/download/adwcleaner/

This finds things that Malwarebytes can miss.

3- Malwarebytes - not the beta version

https://www.malwarebytes.com/mwb-download/

4- your anti-virus

I have had to use these free programs on a couple of friends computers and they cleaned them perfectly.

The safest way to make a backup is to use a Acronis boot disk. But if the computer is infected then Acronis will copy the infection. I run RKill, Malwarebytes and Defender prior to backing up. I only add AdwCleaner if I am having a problem.

Good luck.

Whenever I get something stuck in the back of my throat, I dislodge it by drinking a beer.
It's called the Heineken Maneuver.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware