If it is corrupted, you might get this error message. NTUSER.DAT is a file that contains all the user information.
Once done, close the registry editor and restart your computer to check if the error persists. Repeat the same process with the RefCount key. In the right pane, right-click the State key and click Modify. bak or ba at the end of the sub-key name and hit Enter to save Renaming Entries bak and then right-click the subkey without the extension and click Rename bak extension, that means you have a duplicate entry. Expand the ProfileList, and if there is a sub-key with the. Open the registry editor and navigate to the following path Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList. Once done, proceed to the following methods to fix this error. Once the computer restarts, press 5 or F5 on the keyboard to enable the safe mode. And then click Restart from the bottom right Restarting the Computer to Boot into Safe Mode. The options screen Window will appear click Troubleshoot > Advanced Options > Startup Settings. Hold the Shift key and then click Restart. On the sign-in screen, click on the power button from the bottom right. For that, you need to boot into safe mode. The error often occurs due to duplicate entries, so we have to rename the entries to fix this error. To make changes in Windows, you have to enable the safe mode, as you cannot log in due to the error message. Mainly, this is the leading cause of a corrupted user profile. User Profile Service might be failed to start due to the duplicate profile entry in the registry editor. How to Fix The User Profile Service Failed The Logon? 
However, there are some ways you can use to restore your account.
When this error appears, the user cannot log in to the account as the account might be corrupted or damaged. The error occurs when the User Profile Service is failed to run at the startup.
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