Hello, I can not install PMDG Md-11 because appears this message: "Unable to locate fsx.exe. Unable to install." I have Win 7 64 bit, FSX is installed in C: Help me please!!!!

Are you sure the installer points to the right place, the installer might default to "C:/program files/Microsoft games/Flight simulator x" or something like that, if you have it somewhere else, the installer wont find it. there will probably be a button to choose the setup location manually , Then you can point it to the correct Flight simulator directory.

If other programs also display this behaviour then you might have a registry problem so try the registry fixer tool from Flight1.

Try this link: http://www.flight1software.com/files/FS_Registry_Repair.exe