Problem with users and windows installer Only the primary user can start any program. The primary user can do anything. All users have admin rights. As a example if trying to open/start Internet Explorer all users will get the error message. (The Windows Installer Server could not be accessed. This can occur if the windows installer is not correctly installed.) Some programs will get this error code. 26EE0668-A00A-4407-9371-BEB064C98683
I think what started the problem one of the users switched users during a windows update.
Does each user have their own copy of the Windows Installer?
If I create another user with admin rights the new user gets the same error.