I couldn't get Nero 6 to work either.
I used "sonic"s dvd burning software for a while....then accidently deleted it from my computer

So now I use Nero 7 ...downloaded the demo for it on a torrent site and got the serial number for the full program off a google search.....so now I have the full works.
And it works fine!

If you are wanting to copy dvd's off the original i suggest "dvd decrypter" and "dvd shrink" they seem to make perfect backups of dvd's
not sure if thats what you want to do....but might be of help at some stage.

Sorry I couldn't be more help dude....lol