Re-Installation

Hello Everybody,mightbe, I'll find some help here. I try to install my flight simulator professional edition on my PC (Vista). The first disc is running without without any problems. After the message "insert second disc" the installation stops. It says, that it could find a cab-file on the disc.Stopping the installation it leads to error 1603 and reinstallation.On the disc I can only find an read me file, which says there is an problem with the udl-file system.Has anybody an idea how I can make my simulator running?JoernI hope that this is the right place for posting this question.