Fix User Profile Service Failed the Sign-In
The Windows 10 User Profile Service failed the sign-in error means Windows cannot load the files and settings for your account profile. To regain access, restart the PC, try Safe Mode, and use Microsoft-supported recovery options or create a replacement profile without deleting personal files.
What does the User Profile Service failed the sign-in error mean?
The User Profile Service is the Windows component that loads each user’s desktop, settings, and personal folders during sign-in. If the profile is damaged, incomplete, or temporarily unavailable, Windows may reject the sign-in even when the account credentials are correct.
The message may also say that the user profile cannot be loaded. Searches such as “windows 10 the user profile service failed the sign in,” “user profile service failed the sign in windows 10,” and “windows 10 profile service sign in error” generally describe this same profile-loading problem.
This is different from a forgotten password. Repeatedly changing an unrelated password may not help because Windows is failing after or while it tries to load the local profile.
What should I check before starting Windows 10 profile recovery?
Restart the PC from the power menu. Use Restart rather than shutting the lid or putting the computer to sleep.
At the sign-in screen, confirm that the selected name is the affected account. If another known account is available, try that account once.
Record the complete message exactly as shown. “The User Profile Service failed the sign-in. User profile cannot be loaded” is more useful for diagnosis than a general report that sign-in failed.
Disconnect unneeded USB storage and other accessories, but leave the keyboard, mouse, power, and required network connection available.
If another administrator account works, protect important files before making recovery changes. Do not delete, rename, or replace the affected profile folder.
Phrases including “windows 10 user profile service service failed the sign in,” “windows 10 user profile failed sign in,” and “user profile service sign-in failed windows 10” do not necessarily indicate separate errors. The exact on-screen wording and the account affected are the important details.
How do I try signing in to Windows 10 through Safe Mode?
Safe Mode starts Windows with a limited set of drivers and services. A successful Safe Mode sign-in can show that the profile is still accessible and can provide a route to supported repair tools.
At the sign-in screen, hold Shift while selecting Power and then Restart.
On the recovery screen, select Troubleshoot, Advanced options, Startup Settings, and Restart.
After the PC restarts, choose the option to enable Safe Mode. Use Safe Mode with Networking only if network access is necessary.
Select the affected account and attempt one normal sign-in.
If sign-in works, save accessible personal files to a safe location. Then restart normally and test the account again.
Some encrypted devices may request a BitLocker recovery key before allowing access to recovery tools. Do not guess the key or erase the device. Obtain the correct key from the account, organization, or administrator that manages the PC.
How can I repair or replace a damaged Windows 10 user profile?
For a Windows 10 User Profile Service failed the sign-in problem, the safest supported approach is to use built-in Windows repair tools or create a new account from a working administrator account. Avoid registry instructions that rename or alter profile entries.
If another administrator account is available, follow these steps:
Sign in to the working administrator account.
Open Settings, select Accounts, and use the area for family or other users to add a new account.
If needed, change the new account to an administrator account through the same account settings.
Sign out and sign in to the new account once so Windows creates its profile.
Using File Explorer, copy accessible personal files from the old profile’s Documents, Desktop, Pictures, and other personal folders into the matching folders in the new profile.
Copy personal files only. Do not copy the entire old profile, hidden profile databases, or configuration files, because damaged settings may be carried into the replacement profile. Access to old files may require an administrator, and work-managed files may require help from the organization.
A working administrator may also run Microsoft’s built-in System File Checker and Deployment Image Servicing and Management tools. These tools check Windows system files, but they do not guarantee repair of a damaged personal profile.
Which Windows Recovery options can help with a profile sign-in error?
Windows Recovery Environment provides built-in choices when neither normal sign-in nor Safe Mode works. The available choices depend on the device configuration and recovery data.
Startup Repair: Checks problems that prevent Windows from starting. It may help if the profile error appeared with a broader startup failure, but it is not a dedicated profile repair.
System Restore: Returns system settings to an available restore point. Personal files are intended to remain, but recently installed apps, drivers, or settings can be affected.
Uninstall Updates: Removes a recent quality or feature update when the sign-in failure began immediately after that update.
Reset this PC: Reinstalls Windows. The option to keep personal files is different from a backup and can still remove apps and settings, so use it only after safer choices and protect files first whenever possible.
Recovery may require an administrator password or BitLocker recovery key. Keep the PC connected to power, read each confirmation screen, and do not select an option that removes files unless the consequences are understood and the files are backed up.
Who can help if the User Profile Service still prevents sign-in?
Contact Microsoft Support if Windows recovery options fail, the computer repeatedly returns to the same error, or no working administrator account exists. Contact the device administrator instead if the PC belongs to an employer, school, or another organization.
Have the following information ready:
The exact error message and when it first appeared.
Whether the affected account is local, connected to a Microsoft account, or managed by an organization.
Whether any other account can sign in.
Whether Safe Mode opens and whether the affected profile works there.
Which recovery options were attempted and what happened after each one.
Whether personal files are backed up and whether device encryption is enabled.
Do not share an account password, sign-in PIN, or BitLocker recovery key in an ordinary support message. Those secrets should be entered only into the appropriate trusted prompt when required.