Suddenly my Windows 7 machine the Windows Update could no longer be used. As soon as you click either on Windows Update or the Windows Update settings there was an almost empty screen with just an empty button. If you clicked on it you got error messages like "#elementModuleHeaderText#" etc.
After trying many things I found on Google I finally ran the the following Microsoft Auto Fix: "Automatically diagnose and fix common problems with Windows Update"".
This fixed the issue immediatly. Afterwards I was at least able to view all the settings again. I just was unable to change the some of the settings and I got the message "Einige Einstellungen werden vom Systemadministrator verwaltet“ (in English something like "Some settings are controlled by the system administrator").
To fix this issue I just deleted the following registry key:
and restarted the Windows Update service.