Hi
From our database records, it seems you already installed the prduct on at least one PC. Is this your attempt to install it on another PC?
If yes, then you will also need to reactivate your license key before doing so at
http://www.simdesigngroup.com/shop/inde ... EMAIL_VERI.
A for the initial problem, this means that the MS Flight Simulator registry key is not readable correctly, Please downlaod the ZIP file at
download/SDGRegCheck.zip, then unzip the file and double-click the file "SDGRegCheck.vbs". A box will appear with some information. Please send me back the information you find in that box