如果遇到Windows登錄屏幕上顯示“The User Profile Service failed the sign-in”錯誤，通常意味著加載用戶配置文件時出現(xiàn)問題。1. 嘗試通過啟用隱藏管理員賬戶創(chuàng)建臨時賬戶以訪問系統(tǒng)并排查問題；2. 若原配置文件損壞，可創(chuàng)建新賬戶并復制舊數(shù)據(jù)，同時使用sfc /scannow修復系統(tǒng)文件；3. 檢查注冊表中HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList下的異常條目，并進行更名或刪除；4. 運行chkdsk C: /f /r檢查磁盤錯誤和壞扇區(qū)，確保文件系統(tǒng)正常。

If you're stuck at the login screen with the error "The User Profile Service failed the sign-in" in Windows, it usually means something went wrong while loading your user profile. This issue can happen after an update, a system crash, or if there's some corruption in your user profile. The good news is that there are several ways to fix this without losing your files.

1. Try Signing In with a Temporary Account

When your main account won't load, Windows might create a temporary profile automatically. If not, you can manually create one to access your system and start troubleshooting.

• Enable the hidden administrator account via Command Prompt (available through recovery options).
• Once logged in as admin, check if you can access your original user folder under C:\Users.
• From there, you can back up important files or try repairing the original profile.

This method gives you access to the system so you can dig deeper into what's causing the issue.

2. Repair Corrupted User Profile

If the problem is limited to just one user profile, it may be corrupted. Here’s how to fix that:

• Create a new user account from the temporary admin account.
• Copy your old profile data from C:\Users\OldUsername to the new one (if needed).
• Use tools like System File Checker (sfc /scannow) to repair system-level issues.

Keep in mind: Windows doesn’t always let you just “fix” a broken profile — sometimes starting fresh with a new account is the easiest solution.

3. Fix Registry Issues Related to User Profiles

Sometimes the issue lies in the Windows registry, specifically with how your user profile is referenced.

• Boot into safe mode or use another admin account.

• Open the Registry Editor and navigate to:

  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList

• Look for folders ending in .bak or ones that don’t match your current user SID.

• You can rename those keys to remove .bak or delete incorrect entries (only if you’re sure they’re not being used).

?? Warning: Editing the registry can be risky — make sure you know what you're doing or back up the registry before making changes.

4. Check for Disk Errors or Bad Sectors

Since this error can also stem from disk issues, running a disk check might help:

• From an elevated Command Prompt, run:

  chkdsk C: /f /r

• Restart your PC when prompted so the scan can run before Windows loads.

This helps catch any underlying file system problems that could prevent your user profile from loading properly.

Fixing the "User Profile Service failed the sign-in" error often comes down to either rebuilding the user profile or fixing system-level issues that prevent it from loading. It's not complicated once you know where to look, but it can involve a few steps depending on what caused the problem in the first place.

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