I used this to install Nero 6.6.0.1 with Windows Post Installer setup.exe /SN=XXXX-XXXX-XXXX-XXXX-XXXX-XXXX /WRITE_SN /SILENT /NO_UI /NOREBOOT /NOLICENSE /NOCANCEL The silent installation works fine, but it doesn't take the serial. When I start the program it still ask's me to enter the the SN. And when I enter my key here it works fine. I already checked the number entered as parameter and it's absolutly correct, no typing errors? Can anyone give me a hint?