I have a project that is 7GB and won't fit on a regular DVD. I went and bought an external burner that will burn Dual Layer DVDs. How do I get DVD SP to recognize the new burner?

Just burn the Disk Image with Toast.

Ended up doing that...lol The DVD didn't work right it freezes at the same point every time I play it about 20 min in. Its 2.5 hrs long

What was your MAX data rate? You MAY have peaked over 8mbits which can cause a lot of DVDs to fail.