Im not entirley suer, but it seems that you need a fixed no-cd .exe file...
if you browse game copy world you may find the patch you are looking for.. it will look just like the normal .exe file but will be slightly larger in terms of KB... you then need to download the no-cd.exefile, and copy and paste it into the file on your hardrive where the game is stored... you overwright the origional file, and hey presto... it should work...
hope i was some help.. !
