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Hello David Rosa,
your problem sounds quite like what occured to me aswell. I managed to get the other DVD's running by not starting the installer using Disc 1. After I used the downloadable demo-installer found on x-plane.com under the "try it" section, it also asked me to insert DVD 1 (to provide the installer evidence that I owned the full simulator), but after the files on this DVD were installed I could simply insert DVD 2 after it asked me to switch the DVD's. By using the downloadable installer I managed to get the installation running smoothly every time.
I hope I could help you with my experience!
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