Trying to install the above game, once ive finished installing all 3 disks and try to start the game i get a error message saying MS Flight Sim requires DX8a or higher, please reinstall MS Flight Sim.

Now my PC already has DirectX 9 installed, ive uninstalled and re installed game but keep getting same error message.

Any help would be great on how to solve this problem.

What's the make and model of your graphics card?

Have you downloaded the FS 'service packs' - there can sometimes be issues with certain graphics cards which these patches fix.