A few days ago when I attempted to start FSX-SE I got a fatal error, "Failed to load steamui.dll". I searched online and other people have received the same error but none of the YouTube fixes or any other online suggestions to resolve the error have worked for me. I suspect that since Steam no longer supports Windows XP that may be my problem. Not a life-or-death thing since I also have FSX-SE on my Windows 7 HD, just not with the same airplanes. If any of you have resolved this error and have FSX-SE still running on XP, please give me some details on what you did. Thanks in advance.