Stopping Windows service

[InterestedNewbie]

Thank you Luvu2des, that's a lot of useful info (for many other users as well)! We were already wondering why Windows update was constantly resetting while we definitely disabled the service :-(.

However, in our specific case the culprit of the MSI problem turned out to be a damaged USB audio interface driver causing several programs that use that driver to pop up the Windows Installer repairing procedure. After first uninstalling the driver and then reinstalling an updated version the problem has vanished :-).