Why does Windows 7 update fail to install?

Windows Update may not be working properly because of the corrupted Windows Update components on your computer. To resolve this problem, you should reset those components: Click the Start button in the lower left corner of your screen, then type “cmd“. Right-click cmd.exe and select Run as administrator.

What to do if a Windows Update fails to install?

Windows Update failed to install

1. Try again.
2. Delete Temporary Files and Browser Cache.
3. Disable your Firewall and Anti-virus software.
4. Run SFC and DISM.
5. Run Windows Update Troubleshooter.
6. Manually Reset Windows Update Components to default.
7. Use FixWU.
8. Flush the SoftwareDistribution Folder.