Fix User Profile Service Failed the Sign-in in Windows 10 2025

the The user profile service failed during login. An error in Windows 10 occurs when your user profile is corrupted. This occurs when your operating system can not find your profile in the system directory. This annoying error can be corrected with the methods I am going to show you in this article.

What is a user profile?

A user profile represents a set of parameters and information associated with a user. It is defined as a digital representation of the user's identity and helps to associate features to a user. User profiles store information for attributes such as system requirements, general data, restrictions, and application settings.

It is useful to specify the terms of some system features, such as profile visibility, color themes, preferred languages, date format, and so on. User profiles can be created, modified and deleted depending on the choice.

What causes the failure of the login to the user profile service?

There are several reasons for this error on your Windows 10 PC.

The possible reasons are-

The user profile in the C: / Users / (user name) directory was manually deleted without following the appropriate procedure. When a profile is manually deleted, the security identifier (SID) is always present and the operating system always tries to load the profile whose path to the profile does not match. ;does not exist. That's why the profile does not load.
The user profile was manually renamed without proper procedure that resulted in profile corruption.
A problem with the user profile entering the backup state has occurred.
Corrupted user profile
The antivirus performing scans and blocking user profile files at the time of authorization may also be causing the error.

How to repair the user profile service failed connection error?

Here, I will show you the best possible methods to repair the user profile service. Connection error failed.

Note: Before you try the methods, restart your PC

1. Start in safe mode

Safe Mode loads the computer with the minimum of drivers and services. When Windows does not load correctly, safe mode starts without problems.

Now, here's how to start in safe mode.

Make sure your computer is turned off
Now, press the power button to turn on the computer and hold it until it turns off.
Repeat the process 2 or 3 times until Auto Repair Preparation appears.
Leave Windows to diagnose your PC
Then click on 'Troubleshoot', then on 'Advanced Options & #39;
Then click on the 'Start Up' parameter to continue.
Click 'restart' and then press 4 on your keyboard to enter safe mode.

Loading in safe mode will probably correct the error and you will be able to load it into your profile.

2. Delete the corrupted user profile from the user account

This method attempts to delete the corrupted profile and replace it with the default one.

Note: The user will lose the corrupted profile data

If you do not have an administrator account, follow these steps to create one.

Start in Safe Mode and enable the built-in administrator, then log out of the corrupted profile and log in to the administrator.

Open the command prompt at startup and enable the built-in administrator, then restart and log on to the administrator.

Since you are now in the administrator profile, back up everything you do not want to lose from the C: / Users / (username) directory of the corrupted profile to another location. Then delete the folder.
Now, press 'Windows + R'. to bring the Run dialogue and type "regedit& #39; And click & #39;D & #39; agreement"
This will take you to the registry editor where you have to find this location.

HKEY_LOCAL_MACHINE SOFTWARE Microsoft Windows NT CurrentVersion ProfileList

Now, look for the SID key under the Profile list (usually with a .bak extension) and look at the ProfileImagePath value to see if it is for the same user account name (ex: B) that has the user profile error.
Otherwise, continue searching for the SID key.
After you have found it, right-click and hold down the SID key (for example: … -1014.bak) and delete it.
Click Yes to confirm the removal of the SID key.
If there are several SID key numbers with the same number but no .bak extension, delete them all.

After deleting, close the registry editor.
Now check if you can connect to the relevant user profile.
If so, then copy all the backup files back to the user profile.

This method replaces the user profile assigned by a new one and allows you to access the user profile.

3. Alternative method

Press 'Windows + R' to bring the Run dialogue and type "regedit » and press ok
After opening the registry editor, he had the location

HKEY_LOCAL_MACHINE SOFTWARE Microsoft Windows NT CurrentVersion ProfileList;

Then determine your user profile by checking the ProfileImagePath parameter.

If you find that your user profile and the registry key name does not end with .bak, change the value of the 32-bit DWORD settings. State and RefCount at 0 (create them manually if they are not present)
Suppose there are two same registry keys in the profile tree, simply delete the .bak extension or return them to the main section.
Verify that the settings are set to 0.

If that does not work, create a new profile and copy the profile data to it.

CONCLUSION

These are the possible ways to solve the problem. The user profile service fails to connect error on your Windows 10 PC. I hope you could clearly understand and perform the steps to fix the error.

If the problem is not resolved or if you have difficulty understanding or performing one of the steps, feel free to comment below.

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