Enter the exact update or upgrade error and identify the operation. An HRESULT alone does not show which update package or phase failed.
Protect your files first
Back up important files when possible. If the drive is encrypted, locate the BitLocker recovery key before recovery changes. Stop if storage appears to be failing or this is a work or school managed PC.
Use the tool
How to interpret the result
A Windows Update code may also appear in another feature. Record the KB number, Windows build, and install phase before changing update components.
Protect your data
This tool reads the values you enter in your browser. It does not connect to your PC, execute a command, upload a dump, or collect a recovery key. Keep passwords, product keys, and serial numbers out of public search fields.
Keep track of your checks
This checklist stays in this browser session. It is not sent to WinErrors.