Burned DVD's great sound but no picture??

The first thing I would be tempted to say is that it is a windows CODEC problem. You need to make sure all of the codecs are installed properly for dvd playback, being that you are getting sound and no video. There is a program called G-Spot that will tell you what drivers you have and the ones you need for the video that you are trying to watch. Best of all, the program is free. Just do a search on yahoo for "G-Spot Codec". The second thing it could posiblly be could be that the DVD media type is not 100% compatible with your make of player. This happens regularly with burnt dvds. Try a different type meaning if what you have is a DVD+R try a DVD-R. I hope this helps!

Burned Discs need finalizing - is yours finalized.
Windows Media player may be short of a few codecs- download all you can find
Still in trouble?
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Do you get any error messages?
Have you tried these DVDs on another computer?