Help with make a dvd (nero 6)

HI, im having some troubles with “make a dvd” with Nero 6. First off, I decrypted a homevideo dvd I had previously recorded from my dvd recorder. Then when I created new menus with automation chapter buttons. It messed up the audio. Towards the middle of the dvd the picture gets real slow and the audio is atleast a minute ahead of the video.

Can someone tell me what I’ve done wrong or how to properly do this?