What kind of connections are you using?
If you can use firewire (1394), use it.
Before you burned your DVD was there audio in the video you made. I am not familiar with Dazzle but I have used Pinnacle software before. Is there audio on the timeline or storyboard?
Also, for video capturing, especially if you plan to burn video to DVD, you really need a FAST machine with lots of ram and a fast hard drive. 7200 rpm minimum with mega room. 20 GB's will not cut it. Trust me on this. The video has to be 720x480 to burn to DVD. My 1st hour long production I just finished was 12 GB AFTER production. I have a 200 GB drive and had 56 GB left when I was done. That includes all the raw footage, transitions, etc... that you delete later. Also, try to get a MINIMUM 512MB of ram.
Also, what format are you capturing with? I know pinnacle uses MJPEG, or at least they did. If you can go DV do it. Sony and MS have good DV codecs.
If you still have problems, Pinnacle has a website with tech forums for people having problems. (or at least they did)
Also, Pinnacle software may not work if you have another similar type software installed. When I had the old DC10plus, I had to remove the DV card my old computer had and remove the software.