I think there is a conflict with MS Flight Sim both 9 and X and Google Chrome web browser. I have noticed this on both Vista and Win 7 systems with 32 and 64 operating systems (tried to run on three computer systems with Chrome installed). I went step by step software installation on a clean system and ran into where the sims do no open past the open screen for 9 and X after I installed Google Chrome web browser. BTW I have Firefox and Explorer installed with no problem. Not sure if this works because I have not tried it yet, if you have Chrome installed, uninstall it. Not sure if the registry keeps some remnant around to cause problems, but I am going to try a removal soon and see what happens if it will allow FS to start again. For now I am doing a clean operating system install without installing Chrome and all is fine.