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0x800f0922

The update could not finish. The usual causes are a VPN or firewall blocking Microsoft's update servers, too little space in the System Reserved partition, or a failed .NET Framework 3.5 install.

How to fix it

1. Disconnect any VPN and pause third-party antivirus, then try again.
2. Make sure the PC has at least 20 GB free on C:.
3. Run the repair commands:
4. Open Command Prompt as administrator (search "cmd", right-click, Run as administrator).
5. Run: DISM /Online /Cleanup-Image /RestoreHealth and wait for it to finish (it can sit at 20% for a while).
6. Then run: sfc /scannow
7. Restart the PC.
8. If it is .NET Framework 3.5 failing, turn it on from Control Panel > Programs > Turn Windows features on or off, with the internet connected.
9. If one update keeps failing, download it by its KB number from the Microsoft Update Catalog (catalog.update.microsoft.com) and install it by double-clicking the file.

Is it serious?

Fixable in most cases. If the System Reserved partition is full, that needs a disk tool and some care.