Is everything OK? Microsoft would never contact you out of the blue and even if you asked them for help they very rarely would access your machine.
Current scam you get a call that says I am from MS and we detected a virus on your machine can we call and delete it for you.
I got 1 saying they were from a firm working with MS and that my Pc was shown in a scan of infected machines. Of course how can they get my phone number from MS records? My daughter was lucky she got 2 calls. I have told them to hang up fast.
I would seriously not use your PC for banking etc and scan with the following
From you updated message, my understanding is that MVT scan completed and fixed the registry changes made by the online technician.
Could you please confirm the same? Additionally could you run MVT again and check how long it is taking for intialization?
In case it is taking too long for initiatlization, please attach the log files -
1. mvtapp.log and supportability.log from %temp% location
2. %appdata%\mcafee\Supportability\MVTLogs\Results\ - zip all the files under this folder.