I think you are wrong, installer (as any other program) can request administrative rights or doesnt request them for example if it just copy files to local folder. Also some application based on .NET are distributed using ClickOnce technology without msi and setup files and without administrative rights and working in partial trust environment. Imaging following case when administrator installed scanner with hardware and twain drivers after that user came and run application which just copy files and its own twain driver (for image processing for example) in local folder…