Insider Fast Track Office
Yes follow what has been posted but you may need to install and run Revo Uninstaller it comes with a 30 day trial.
When I uninstalled mine, I found it had left behind some folders with some files still in it
How I got rid of them was
Scroll to C Drive
Then go to Programs where you should find the folders that is where you can use Revo
Also go to Programs X86 where you should find the same again do as above
Once Revo had found them just click delete and lot of files may come up put a tick in all of them then press delete.
Mine took about 5-10 mins to clear on both.
Once done McAfee will be gone forever
Then you will find Defender working
Bring it up and click Update
Once done it will need to scan
Once Scanned you are then fully protected
Get back to us if you get stuck