Windows Update error 0x80070643
TL;DRThis error means Windows Update hit a fatal problem during an update installation, often stopping the process from completing.
Most likely cause: Problem with .NET Framework or related components
Try first: Run the built-in Windows Update troubleshooter
Likely causes
- Problem with .NET Framework or related componentsmost likely
- Corrupted system files or update cachepossible
- Interference from security softwareless likely
How to fix it
Safest first: SafeChanges settingsDangerous
Run the built-in Windows Update troubleshooterSafe
Open Settings > Update & Security > Troubleshoot > Other troubleshooters and run Windows Update.
Restart the computer and retry the updateSafe
Fully shut down, wait 30 seconds, turn back on, then check for updates again.
Repair system files with SFCChanges settings
Open Command Prompt as administrator and run the scan to check for and fix corrupted files.
sfc /scannow
If that didn't fix it
Open Command Prompt as administrator and run DISM /Online /Cleanup-Image /RestoreHealth
When to see a technician
Contact a technician if the error continues after trying the repair commands and you are not comfortable running advanced system tools.
Quick answers
- What does Windows Update error 0x80070643 mean?
- This error means Windows Update hit a fatal problem during an update installation, often stopping the process from completing.
- What causes Windows Update error 0x80070643?
- Problem with .NET Framework or related components. (most likely) Corrupted system files or update cache. (possible) Interference from security software. (less likely)
- How do I fix Windows Update error 0x80070643?
- Try these in order, safest first: 1. Run the built-in Windows Update troubleshooter. 2. Restart the computer and retry the update. 3. Repair system files with SFC.
- What if that didn't fix it?
- Open Command Prompt as administrator and run DISM /Online /Cleanup-Image /RestoreHealth
- When should I see a technician?
- Contact a technician if the error continues after trying the repair commands and you are not comfortable running advanced system tools.