i have tried all the methods Phoenix have stated and still dosent work, when i tried to run it still say insert the correct disc.
Alas, the answer is simple: you don't have (of don't have put) the original disc in the drive, the game looks for the original disc in the drive for copy protection and doesn't let you play the game with a simple backup copy. It's little unfair, isn't it? The game forces you to use the original disc to play (risking to scratch it) it. But this is to stop piracy... The only way to use a "backup copy" (and to keep your original disc in a safe place) is eithar make a '1:1 copy' with special software like Alcohol 120%, Clone CD, DiskJuggler or to use a patched executable for that game which avoids it to make a disc control but, alas, the game also always asks you, when it starts, for a valid serial key which only who owns the original CD knows...