thx for your fast reply. The installation with your parameters works fine. But it isn't an real "silent" installation, because there`s the question about file types. It would be a great feature to make the setup completely unattended.
We installed your software on 20 PCs for testing and if the test result is positiv by the users of those PCs, we will buy many (about 20-70) licences. With this background a complete unattended setup would we great for our software administrators