How to Fix Fix Windows Error 0x80070673 — Installer Assembly Reference Invalid on Windows
Getting Windows error code 0x80070673? Windows Installer assembly reference invalid or .NET assembly binding failure during update? Fix error 0x80070673 with step-by-step solutions.
Symptoms
You might be experiencing this problem if you notice:
- •Error 0x80070673 when installing .NET Framework updates
- •Windows Update fails with assembly reference error
- •Application installations fail referencing assembly binding issues
- •MSI installer reports invalid assembly reference during setup
- •Visual C++ redistributable installations fail with this error
- •System component updates fail with manifest or assembly errors
Common Causes
- ⚠Corrupted .NET Framework installation
- ⚠Windows side-by-side (WinSxS) assembly store corruption
- ⚠Missing or damaged assembly manifest files
- ⚠Incomplete previous installation left orphaned assembly references
- ⚠Component store corruption preventing assembly resolution
- ⚠Conflicting versions of the same assembly installed
Solutions
Solution 1: Repair .NET Framework
- 1Download the Microsoft .NET Framework Repair Tool
- 2Run the tool as Administrator
- 3It will automatically detect and fix common .NET issues
- 4Follow the prompts to apply recommended repairs
- 5Restart the computer after repair completes
- 6Retry the failed installation or update
- 7If the tool is unavailable, try re-enabling .NET from Windows Features:
- 8Open optionalfeatures.exe → uncheck .NET Framework 3.5 → Apply → recheck → Apply
Solution 2: Repair Component Store
- 1Open Command Prompt as Administrator
- 2Run DISM to repair the component store:
- 3DISM /Online /Cleanup-Image /RestoreHealth
- 4Wait for completion (may take 15-30 minutes)
- 5Run system file checker: sfc /scannow
- 6If DISM reports errors it cannot fix:
- 7Try with Windows source: DISM /Online /Cleanup-Image /RestoreHealth /Source:C:\path\to\install.wim
- 8Restart and retry the failed update
Solution 3: Clean Install Affected Components
- 1Open Settings → Apps → Optional features
- 2Search for and remove the affected .NET or Visual C++ component
- 3Restart the computer
- 4Reinstall the component from the official Microsoft source
- 5For .NET: Settings → Apps → Optional features → Add a feature → .NET Framework
- 6For Visual C++: download latest redistributables from Microsoft
- 7Clear Windows Update cache before retrying:
- 8net stop wuauserv && ren C:\Windows\SoftwareDistribution SoftwareDistribution.old && net start wuauserv
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