How to Fix Fix Error 0x8007049C — Windows Update Component Registration Failed on Windows
Getting error 0x8007049C during Windows Update? Component registration failed? Update agent unable to register component? CBS component store registration error? Service registration incomplete during update? Fix this Windows Update component registration error.
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Main Troubleshooting Guide
How to Fix Windows Update Errors →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •Windows Update fails with error 0x8007049C
- •CBS log shows component registration failure
- •Update installation rolls back after reaching registration phase
- •Multiple updates fail with same registration error
- •Feature updates stop during component setup
- •DISM shows component store inconsistency
Common Causes
- ⚠Component store database has inconsistent registration entries
- ⚠Previous update interrupted during registration phase
- ⚠Corrupted WinSxS component registration data
- ⚠Disk space insufficient for component registration
- ⚠TrustedInstaller service unable to complete registration
- ⚠Third-party software interfering with component registration
Solutions
Solution 1: Repair Component Store Registration
- 1Fix component store inconsistencies:
- 2CMD as Admin:
- 3DISM /Online /Cleanup-Image /CheckHealth
- 4DISM /Online /Cleanup-Image /ScanHealth
- 5If corruption found:
- 6DISM /Online /Cleanup-Image /RestoreHealth
- 7This repairs component registration database
- 8Follow with: sfc /scannow
- 9Restart PC
- 10Retry Windows Update
- 11If DISM RestoreHealth fails:
- 12Use Windows installation media as source:
- 13DISM /Online /Cleanup-Image /RestoreHealth /Source:D:\sources\install.wim
Solution 2: Reset Update Components and Clean Cache
- 1Full update component reset:
- 2CMD as Admin:
- 3net stop wuauserv
- 4net stop cryptsvc
- 5net stop bits
- 6net stop msiserver
- 7net stop trustedinstaller
- 8Delete pending registrations:
- 9ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
- 10ren C:\Windows\System32\catroot2 catroot2.old
- 11Re-register update DLLs:
- 12regsvr32 /s wuaueng.dll
- 13regsvr32 /s wuapi.dll
- 14regsvr32 /s wups.dll
- 15net start trustedinstaller
- 16net start wuauserv
- 17net start cryptsvc
- 18net start bits
- 19net start msiserver
Solution 3: Ensure Disk Space and Manual Update
- 1Component registration requires significant disk space:
- 2Check C: drive has at least 20 GB free
- 3Clean up with: Disk Cleanup → Clean up system files
- 4Check "Windows Update Cleanup" and "Previous Windows installations"
- 5Also: DISM /Online /Cleanup-Image /StartComponentCleanup
- 6If specific update keeps failing:
- 7Note the KB number from Windows Update history
- 8Download from catalog.update.microsoft.com
- 9Install standalone MSU file
- 10For persistent registration failures:
- 11In-place upgrade repair using Media Creation Tool
- 12This rebuilds all component registrations
- 13Files and apps are preserved
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