My guess is that you may be trying to burn a dvd that is not compatible with your dvd reader/writer
Some DVD players, particularly older ones have problems with different formatted DVD's for example there are DVD+R, DVD+RW, DVD-RAM, DVD-R, DVD-RW, DVD-RO
Work out what DVD player you have and check that the format is compatible.
www.lmgtfy.com/?q=dvd+formats+explained