need to know how to burn a dc game that is already burned on a cdr

my friends has a lot games that he bought from some guy that has been burned on a cdr already so there not the original one there just back ups i just wantd to knoe how to copy them cause i tried to copy them using both nero and cdrwin they just copy like a lil bit of it butnot the whole thing it just like copying the original it copys the first layer but when i go to windows explore i can save the whole cd to my hard drive can i just make a ghost copy pls help me or can i use a different program