Help on cd-protection

[Overture]

Hi! im a noob in this field, and i got a game quite old, its called Return to Krondor. i had both cds( they are 2) and 2nd cd had som many riscs on it, that stoped reading, so i got 2nd cd from a friend, a backuped one...
So, i got 2 backup cds and the problem is that when the game askes for cd 2 it wont recognize that cd when i put it in cd tray.

i´ve read various tuturials including some on this Forum, i know that the cd protection is "Overburn" i know what that means and maybe how it works.
But i cant make 2nd cd acceptable for the game.

is there someone that can give me some "Lights"?!?
How can i make the game to accept the 2nd cd?!?

Sorry My ignorance and My english.

This is my first post here, and this is a great forum
keep it up.