Install dosbox. create a folder on your hard drive (c is my default). name it whatever you like. mine has been named dosbox. Then run dosbox and type "mount "drive letter" "drive letter:\"folder name". In my case it is "mount c c:\dosbox
Then when the drive is mounted, close the program.
The easiest way to run the game is to open both the discworld folder and the dosbox folder. JUST SIT THEM SIDE BY SIDE ON YOUR DESKTOP. Drag the discworld exe onto the dosbox exe and it will run with full sound.
I have tried to write this as clearly as possible so i hope nobody has any problems with it.
There was problems with english.idx and english.smp files missing but these ARE in the file and this game works perfectly now.