How to Fix Windows User Profile Corrupted on Windows
Getting "User Profile Service failed the sign-in" or loading a temporary profile? Fix corrupted user profiles and recover your desktop settings and files.
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Main Troubleshooting Guide
How to Fix Windows Boot Loop →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •"User Profile Service failed the sign-in" error at login
- •Logging into a temporary profile (blank desktop, no files)
- •"We can't sign in to your account" notification after login
- •Desktop settings, icons, and customizations all gone
- •Profile loads but all apps and settings are reset
- •Multiple user profiles appearing for the same account
Common Causes
- ⚠User profile registry entries corrupted
- ⚠Profile folder permissions changed
- ⚠Disk error affecting the profile folder
- ⚠Windows Update corrupting profile during update
- ⚠Antivirus quarantining profile files
- ⚠SID (Security Identifier) mismatch
Solutions
Solution 1: Fix via Registry (ProfileList)
- 1Boot into Safe Mode (hold Shift while clicking Restart)
- 2Open Registry Editor (regedit)
- 3Navigate to: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
- 4Look for your SID entry (the long S-1-5-21-... string)
- 5If you see two entries — one with .bak: rename the .bak one to remove .bak
- 6Delete or rename the non-.bak duplicate, then restart normally
Solution 2: Create a New Profile and Migrate Data
- 1If the profile can't be repaired: create a new local admin account
- 2Settings > Accounts > Other users > Add someone else
- 3Create a local account with admin privileges
- 4Log into the new account
- 5Copy files from: C:\Users\OldUsername to C:\Users\NewUsername
- 6Copy Desktop, Documents, Downloads, Pictures, and AppData folders
Solution 3: Recover from Temporary Profile
- 1If you're in a temporary profile: DO NOT delete files — they're in a temp folder
- 2First try: restart the computer 2-3 times (sometimes it self-heals)
- 3If persistent: follow the Registry fix above
- 4Files from the temp profile are at: C:\Users\TEMP or C:\Users\TEMP.000
- 5Your real files are still at: C:\Users\YourUsername
- 6The issue is just the profile loading mechanism, not the actual files
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