Thank you Captain Kevin. I found yesterday that Ground Services program for Flight Simulator X is not working properly. I wanted to use it in an Airport as I was doing with no problem, but suddenly the menu did not appear, so I wanted to reinsatall this program with my serial number, but when I complete this, then the eSellerateEngine message appears, and this is how I found where this message comes from, and is impossible to reinstall the program, so I do know what else I can do to solve this. I sent a message to PC Aviator, where I bought the product, but they do not answer to my problem. that is Captain. Thank you very much.