Restore Registry from Automatic Backup: Boot into Recovery Mode: Hold Shift while clicking Restart
👇 See all 3 solutions belowWhat is Error 794?
Windows System Error Code 794, known as ERROR_CORRUPT_LOG_OVERFULL, is a File & Disk error that occurs during file system and disk I/O operations. The error indicates that: One of the volume corruption logs is full. Further corruptions that may be detected won't be logged. When this error is encountered, the Windows operating system was unable to complete the requested operation within the file management subsystem. The error code 794 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_CORRUPT_LOG_OVERFULL 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 file system and disk I/O operations 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
Resolving Component Store (WinSxS) Bloat and Corruption
An encyclopedia on the Windows Component Store: safely reclaiming disk space, understanding hard links, and fixing deep WinSxS corruption.
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 "*794*" -or $_.Message -like "*ERROR_CORRUPT_LOG_OVERFULL*"} | 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