Windows 11 · Windows
Fix Windows Update Error 0x80070643 on Windows 11
Source-checked About 10 minutes
Answer
Record the exact failed update, run the Windows Update troubleshooter, check storage, and repair Windows components before retrying. The preserved URL contains 0x90070643, but the documented code is 0x80070643.
Record the exact failure
Open Settings > Windows Update > Update history and note the KB number, update name, and exact code 0x80070643. Different KBs can require different fixes.
Restart and retry
Save open work, restart once to finish pending servicing operations, then return to Windows Update and retry the same update.
Run the update troubleshooter
Open Settings > System > Troubleshoot > Other troubleshooters, find Windows Update, choose Run, and apply the actions it presents.
Check available storage
Open Settings > System > Storage and free space using files and apps you recognize. Do not delete recovery or system partitions for ordinary update space.
Repair Windows components
In an elevated Terminal, run DISM.exe /Online /Cleanup-image /Restorehealth, wait for completion, then run sfc /scannow. Restart and retry.
Escalate by KB number
If it still fails, use the exact KB and Windows version with Microsoft Support. Resize a recovery partition only when Microsoft's article for that exact update explicitly requires it.
Video walkthrough
If it does not work
- An older Windows 10 recovery update used the same code for a specific partition issue; do not apply that procedure to an unrelated Windows 11 KB.
- If DISM or SFC cannot repair an error, save the exact result for Windows servicing support instead of repeatedly resetting update folders.
Sources and verification
Checked against official documentation on . Scope: Windows.
Follow the linked first-party guidance if labels differ after a platform or app update.