That sounds about right. Don't try burning with XP's built in burning support - it is fairly crappy. Use a proper burning program like
Nero for that.
A useful tip is that if you are just doing tests to see if the burner works properly, get hold of DVD+RW (or DVD-RW) disc and use that to do your burning tests. That way if it fails, you can always erase the disc and use it again. You won't have to waste discs and money on those tests. You can move on to normal DVD+/-R discs when you are reasonably sure everything is ok.