Have already confessed, I don't do Windows ... so some more 'translation' is required on your part, but ...
How large a file are the original .mbz files? You can download, un-compress and inspect moodle_backup.xml file for lots of info related to the version and modules contained.
Look in your moodledata/temp/backup/ directory. A backup has to be un-compressed first and inspected *before* moodle begins the restore attempt.
You should see long directory names .... bunch of letters numbers ... change into one if you find them.
Inside ... is there a moodle_backup.xml? That's the roadmap to the restore.
.xml files present there map to related ... files.xml goes with 'files' directory.
How large is the questions.xml file?
Question banks take a long time to process. larger questions.xml file = longer.
What are your php settings for memory a script can consume, length of time a script can run - and DB settings like max_allowed_packets, ...
And there is no log anywhere that shows anything of the restore attempts?
'SoS', Ken