How to Fix Fix Error 0x8007049F — Windows Update Component Trust Verification Failed on Windows
Getting Windows error 0x8007049F? Update component trust verification failed? Windows Update cannot verify component integrity? Update trust chain broken? Component signature validation error? Fix error code 0x8007049F.
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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 0x8007049F
- •Cumulative updates download but fail to install
- •Update log shows trust verification failure
- •Multiple updates fail with same error code
- •Feature update cannot verify component signatures
- •Update Assistant reports integrity check failure
Common Causes
- ⚠Windows Update component store integrity compromised
- ⚠Trusted installer service not running or corrupted
- ⚠Certificate chain for update packages broken
- ⚠Previous failed update left component store inconsistent
- ⚠System file corruption affecting update trust anchors
- ⚠Third-party security software interfering with update verification
Solutions
Solution 1: Reset Windows Update Components
- 1Stop update services:
- 2CMD as Admin:
- 3net stop wuauserv
- 4net stop cryptSvc
- 5net stop bits
- 6net stop msiserver
- 7Clear update cache:
- 8ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
- 9ren C:\Windows\System32\catroot2 catroot2.old
- 10Restart services:
- 11net start wuauserv
- 12net start cryptSvc
- 13net start bits
- 14net start msiserver
- 15Retry Windows Update
Solution 2: Repair Trusted Installer and System Files
- 1Verify Trusted Installer service:
- 2Win+R → services.msc
- 3Find "Windows Modules Installer" → should be Manual start
- 4If stopped, start it
- 5Repair system files:
- 6CMD as Admin:
- 7DISM /Online /Cleanup-Image /RestoreHealth
- 8sfc /scannow
- 9Update root certificates:
- 10certutil -generateSSTFromWU roots.sst
- 11certutil -addstore -f root roots.sst
- 12del roots.sst
- 13Restart PC and retry updates
Solution 3: Manual Update Installation
- 1If automatic update still fails:
- 2Note the KB number from Windows Update
- 3Visit Microsoft Update Catalog: catalog.update.microsoft.com
- 4Search for the KB number
- 5Download the correct version (x64/ARM64)
- 6Install manually by double-clicking the .msu file
- 7Or via CMD:
- 8wusa.exe KBxxxxxx.msu /quiet /norestart
- 9Restart PC after installation
- 10Check Windows Update again for remaining updates
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