i've just got the game and i do what it said on the instructions to go into your dvd rom drive and all that and i clicked on autorun and came up with this thing saying D:/autorun.exe is not a valid win32 application. so i really dont know what to do.

Navigate to the drive icon, right click it, choose 'Open' to open the disc and look for the installation file. Double-left-click on the installation file to get the installation started.

It should be a '.exe' file. It might even be 'install.exe'

I don't know the exact name (I've not yet got the game).