I have the 12 disk version of Microsoft Flight Simulator. My question (problem) is that I have to reinstall the program do I have to use the 12 disks to reinstall the program, or does the program key allow me to download a digital version of the program avoiding the tiresome problem of reinstalling. I am asking because I may have caught a virus and have to reinstall the operating system. I know bummer. Please help and thank you.