Basically I've had a few ethereum coins on my laptop, I upgraded windows 10 to its newer version. I can't remember if I had windows 8 or 10 before but regardless I upgraded it and I totally forgot to backup my ethereum wallet that I had safed on the previous version. It doesnt let me go back to previous build as its been a few months so it doesnt display that option. Also windows.old folder is gone. Does anybody know how I could get it back?