Windows 11: install the fix and check that it is really complete

Before you start

Applies to Windows 11. Save your work before installation or restart. Follow the organisation's update process on a work computer; do not change update sources or registry settings on your own.

Step by step

1. Open Start → Settings → Windows Update and select Check for updates. Installation changes the computer. [1]
2. If a restart is required, save your work and choose a suitable time. Microsoft also describes how to schedule the restart. [1]
3. After restarting, open Windows Update again and check for any remaining actions.
4. Open Windows Update → Update history. Check that the intended security update was installed and record its KB number. [1]

Verify the specific fix

Compare the installed KB with Microsoft's page for your Windows version. Open Run with Windows key + R and enter winver to read the version and OS build; it changes nothing. An older KB may be superseded by a later cumulative update, so check Microsoft's current release information. [2]

If the update is missing or fails

1. Record the KB number, error code, Windows version and whether a restart is pending.
2. On a managed computer, ask IT to check approval, assignment and reported installation status.
3. Do not try to fix the problem by deleting update files or disabling security protection without a troubleshooting plan.

Done when

• The intended fix or a verified replacement is installed.
• Any required restart is complete.
• The computer's important programs work after the update.

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