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0x8007371b

One or more parts of the update are missing from the component store.

How to fix it

1. Open Command Prompt as administrator (search "cmd", right-click, Run as administrator).
2. Run: DISM /Online /Cleanup-Image /RestoreHealth and wait for it to finish (it can sit at 20% for a while).
3. Then run: sfc /scannow
4. Restart the PC.
5. 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?

DISM fixes most cases.