is this a copied game? cuz if it is, it won't work if your trying to install it cuz that's the copy protection that's preventing you from doing so.
if it is not, then either your cd drive needs to be cleaned using a cd cleaner or the Cd itself is dirty, clean it off gently by rubbing from the center out towards the rim.
if it is not, then either your cd drive needs to be cleaned using a cd cleaner or the Cd itself is dirty, clean it off gently by rubbing from the center out towards the rim.