What region are you in?
If you are in the USA don't set the default region to 2 as the previous poster mentioned, region 2 is Europe.
Why are you using
Nero to burn the VTS files?, why don't you just use ClonedDVD for the whole process, much simpler that way.
Make sure you have the latest versions of
CloneDVD(2.4.5.4) and
AnyDVD(4.0.4.1).
AnyDVD should make your disk region free and capable of playing in regions 1-8.
To see what region you burned at you can download a free utility that will display who the manufacturer is of the media you used, as well as regions. You can download it at dvdinfopro.com. I have the registered Pro version 3.29 and it has the ability to change booktypes of several burner manufacturers. To see the burned DVD information click on the media icon, second from left on top. To change the booktype, click on the +RW icon. I'm not sure the free version has the ability to change booktype.
Have you tried played the burned DVD in a home player rather than the car?
Don't know if the car player came with a manual but I would try to find out what disks it is capable of playing.
Last but not least, I always burn using DVD+ media and I have my Liteon burner set that it will change the booktype from DVD+ to DVD-Rom.
YOU CAN'T CHANGE BOOKTYPE ON DVD- MEDIA, ONLY DVD+.
DVD-Rom is accepted by almost any player. To clarify, DVD-Rom is not a burn using DVD- Media. Check you burner and see if you able to change the booktype through it's firmaware. Liteon's have a software utility that can do this.