0x80073701
Moderate
Microsoft · Windows
The referenced assembly could not be found. A required component assembly or its manifest is missing from the WinSxS store, preventing the update from being applied.
Quick Answer
Error code 0x80073701 on your Microsoft Windows means: The referenced assembly could not be found. A required component assembly or its manifest is missing from the WinSxS store, preventing the update from being applied.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Run DISM to repair the component store: DISM /Online /Cleanup-Image /RestoreHealth — this is the primary fix for missing assemblies.
2
If DISM fails online, use Windows installation media: Mount the ISO and run: DISM /Online /Cleanup-Image /RestoreHealth /Source:wim:D:\sources\install.wim:1 /LimitAccess.
3
Run sfc /scannow after DISM completes to verify system file integrity.
4
Check the DISM log for specific missing assemblies: Open C:\Windows\Logs\DISM\dism.log and search for the error to identify which assembly is missing.
5
Also check the CBS log: C:\Windows\Logs\CBS\CBS.log — search for 'ERROR_SXS_ASSEMBLY_MISSING' to find the exact assembly name.
6
Restart and retry Windows Update after component store repair.
7
If the issue persists, perform an in-place repair upgrade to completely rebuild the component store.
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
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