Gta Vice City

I need help running my GTA Vice City Game. I havent played it in a very long time but its just one of those things that I get when I wanna play a game and that game is Vice City but the problem is I cant find my copy but its installed on my computer how can I make it run? someone told me to use powerISO and it kinda worked but it says wrong cd you need play and I dont get it I tried mouting both disc I need help anyone PLZ.

With what program did you make the backup?
Does it work with your original?