Windows Update error 8024402C (Windows 7)
It took me a while to fix this issue but if you follow exactly this document from Microsoft
http://windows.microsoft.com/en-US/windows-vista/Windows-Update-error-8024402C
you will be able to understand the error and fix it too.
The problem is the fact that the updates may be handled by a WSUS server. To find that out go to
programs ->Windows updates and locate the following
The only way to run update is by clicking on the link that is just underneath the "Managed by you system administrator" titled:
Check online for updates from Microsoft Update Service.