I took the windows 10 upgrade, it reached around 30% then stopped and left a blank screen with 'no operating system' top left corner.
I too it to a local 'specialist' who got is started agian, he said it automatically reverted to windows 7 and all my files and programs everything was gone.
I have tried using data recovery tools like diskdigger and easeus data recovery wizard. They have produced nothing only temporary internet files. It finds nothing at all from prior to the upgrade.
Have my files vanished forever??????