I got this message yesterday morning and it was too much for my tiny brain on a Sunday morning. Having tried the fix of just restarting the computer a couple of times I just left it and went on to have a lovely day. As I thought about it I decided going to the registry first was not going to be what I’d do. I could locate my files by going onto the C drive , going to Windows and finding my old profile under Users. The virus and malware checkers were still functioning so I knew what I had loaded previously had to be there. I found appuals site the most helpful because it was going from easy solutions to more complicated ones. On the temporary profile I had linked my Microsoft account and set a PIN as they suggested. I thought maybe that would release my own desktop but no. In the end I did an old fashioned ScanDisk from the dos prompt.
1. Right click on start and select Command Prompt Admin
2. Type in : sfc/scannow
3. It takes about 15 minutes to scan the files and shows you the percentage.
4. Turn off the computer and restart.
The sfc (scan files now) reported no errors and so I wasn’t hopeful. Good news was it had worked and my own lovely profile was back in place! It would appear the fix is easy but what seems to be happening is different fixes are working for different people. By the time you look at tenforums and appuals you have lots of options and hopefully one of them will work for you.