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I am so sorry to hear that this happened to you. Data loss is never easy to deal with but I have a couple of suggestions for you. Using data recovery software can sometimes recover old files. I'm not sure if it will work because of the new OS download but that is the only direction I can suggest. Here are a couple of different sites: http://www.piriform.com/recuva or cleverfiles.com look for diskdrill.
I would also call Microsoft and let them know what happened. They need to know so they can find and fix that bug.
Thank you for choosing JustAnswer.comtoday, Amy
Yes I would be willing to connect remotely for you to see if I could help with this OS problem. I sent an offer of a premium request for you.
Here is the link to the session.
This is about helping you but I have to follow these rules. I'll gladly refer to another technician. Thank you.