VCD and DVD ain't the same thing....
If you can play the Disc in your PC then i would say NERO6 has worked.
When you open NERO you have to select DVD or CD.
if you choose CD then your video files are written as VCD. If you choose DVD then they become DVD.
I would think the DVD player that you are using does not support the disc format.My DVD player will play just about any Disc you care to throw at it,but it wont play DVDRW (rewritable DVD disc's)
My other DVD player, which is a cheap Phillips player, will play DVDRW'S with out any prob's.
What Disc's are you using? Do you have access to another DVD player?
NERO6 works fine for me.