the first time that I used this to make a movie the movie came out fine but every since then the movies wont play in my dvd player and I havent changed anything within the program or anything so I need some suggestions please I have tried almost everything I dont know what to do please help me!!
I wasn't sure what device you were talking about, so I looked it up. The Sony DRX-720UL is a DVD burner that burns DVDs to the +R, +R DL and +RW formats. This article explains the different formats and what they mean:
http://www.techlore.com/article/10282/
So, I'm assuming that you are using this device to burn DVDs to play in a different DVD player.
First off, does the DVD play in the DVD drive that created it? Try that first. If it does, you probably have a compatibility issue with your other DVD player. There are a few articles which talk about compatibilities with DVD media and DVD players. Here's one:
http://www.techlore.com/article/10511/