What games are they?
If you search for the game on this forum, you will most likely find what protection it has (or use one of the many programs mentioned here, such as ClonyXXL, to detect the protection) and read the many sticky threads in the various sections to learn how a copy protection can be beat.
Furthermore, provide more info on your system, such as writer, reader and software used. The information you provided is too little to give you an answer, it like saying "My car broke down, it won't start, what should I do?".