Need help installing windows 7 on my Imac using bootcamp

Hi everyone so I just got a new mac and I gotta say not very tech smart when it comes to apple products but Ive been trying to install windows 7 using bootcamp now just making it clear that I am using a ledgitimate legal windows cd and not a copy. I dowloaded the necessary updates to a cd i took every step that i needed that i found and when it came to installing the software on my mac after i insert the disc it will start reading and make a sound like its reading the disc but then would stop after a few seconds and the i get a message to insert a windows disc and wait till its recognized to install. Ive done that waited till it was recognized and clicked install and same thing happens ive tried 3 different microsoft corp windows programs and its the same thing with all of them. I did put different cds music and movies and it read them quick and played them without a problem seems like its only the windows discs. Please help any solutions references and suggestions would be greatly appreciated thanks