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WU_E_SETUP_REGISTRATION_FAILED
WU_E_SETUP_REGISTRATION_FAILED means Windows Update Agent setup called regsvr32.exe and that registration step returned an error. The final code does not identify the DLL or the inner error by itself.
What to check
- Locate the earlier setup log entry that names the component and the underlying registration error.
- Check for pending reboot, damaged servicing state, or a blocked setup transaction.
- Avoid running broad manual registration scripts; they can obscure the original servicing problem.
Microsoft: Windows Update log files
Microsoft: Servicing stack updates
Microsoft: Windows Update error reference
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