Hi Gregdrum
I'm not with Laminar Research, just a fellow simmer in the UK, but it might worth downloading the demo version of X-Plane 11 from LR's website to see if this works?
If it does work, then that will rule out any issues with PC hardware and you should then be able to run X-Plane 11 by making sure that you DVD disc 1 is in the DVD ROM tray at all times. If you have purchased a genuine DVD set from LR, then disc 1 should provide the necessary product licence key to keep running X-Plane 11.
If the downloaded demo version doesn't work for some reason, then you'll need to double check your PC specification at least, to see if it meets LR's minimum requirements?
Regards