Installation does not start

Hello everyone,
has anyone else the problem that the installation does not start, when they start the “Start Installation.exe”?
After starting and the update procedure nothing happens. Also starting the “Setup.exe” in the folder “Nuendo for Windows” nothing happens.
The only way I can install Nuendo is starting the “Nuendo8.msi” directly. Then I can install, but without any add-ons and so on.
Is there a solution for this? I have Windows 7, 64 Bit with the latest Windows updates installed.