I Need Help with The Sims!!

[smitty]

I have tried to make a valid backup disc for the sims but I am having trouble. I used nero and it seemed to work perfectly. I can install the sims completely, but when I go to use the backup disc to play the game it says that I have to insert the correct disc. I used the backup disc to install the game, and when I load the disc into the cd-rom the auto load program works. The sims screen comes up asking me if I want to play. 800x600 and so on. The start-up screen is what I am refering too. ANY IDEAS???