Lost all my data and im trying to recover it

[Windows 10]

So when i turned on my PC, they wrote something that was like "fixing disc C:" and there was numbers like a random number out of a full number like it was clearing all data, when i wrote my PIN, i found my PC empty and there was a window with "cannot sign in to your account, try signing out and signing in" thats all i could remember. so i went to regedit (registry editor) and fixed some things, but my PC keeps clearing everything i did after i sign out or restart or anything like that. it keeps clearing things such as pinned task bar icons, any games I had, my appdata and everything. so i mov

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