I had a similar problem when I first got my Liteon 811.
If you upgrade to Nero 6.3, it should work fine. Nero 6.3 defaults to all of the correct setting for you when you select "Video DVD".
If you are running Nero 6.0 or earlier, After selecting "Video DVD" try changing the following settings to see if that helps you.
ISO tab-
File Name length - ISO level 1
Character set - 9660
un-check "Joliet"
Relax ISO restrictions -
Check the top two, leave the last un-checked.
That is what worked for me anyways, best of luck.
BTW, there is a program out that is freeware called DVD shrink.
www.dvdshrink.org Does the same thing as DVD Decryptor and DVD2one in one step. It will even automatically port into Nero, but I haven't tried that function yet.