Restore Registry from Automatic Backup: Boot into Recovery Mode: Hold Shift while clicking Restart
👇 See all 3 solutions belowWhat is Error 1021?
Windows System Error Code 1021, known as ERROR_INTERNAL_DB_CORRUPTION, is a Configuration error that occurs during system configuration and registry. The error indicates that: Cannot create a stable subkey under a volatile parent key. When this error is encountered, the Windows operating system was unable to complete the requested operation within the configuration management subsystem. The error code 1021 is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name ERROR_INTERNAL_DB_CORRUPTION maps directly to this numeric code and is commonly referenced in Microsoft documentation, developer forums, and system logs. Understanding this error and its context within system configuration and registry is essential for effective troubleshooting.
Common Causes
- Malware or aggressive cleaners modified critical registry keys
- A failed software installation or update corrupted registry hives
- Power loss during Windows shutdown caused registry file corruption
- Manual registry editing without proper backup went wrong
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Read the full guide →Step-by-Step Solutions
- Boot into Recovery Mode: Hold Shift while clicking Restart
- Go to Troubleshoot → Advanced Options → Command Prompt
- Run: copy C:\Windows\System32\config\RegBack\* C:\Windows\System32\config\
- Type 'Y' to overwrite each file when prompted
- NOTE: On Windows 10 1803+, RegBack may be empty; use System Restore instead
Video Tutorials
Diagnostic Command
Run this PowerShell command to find related events in your system log:
Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*1021*" -or $_.Message -like "*ERROR_INTERNAL_DB_CORRUPTION*"} | Format-List💡 Open PowerShell as Administrator, paste the command above, and press Enter.
Prevention Tips
- ALWAYS export a registry key before modifying it (right-click → Export)
- Avoid 'registry cleaner' software — they often cause more problems than they solve
- Use System Restore points before installing new software or drivers