[TheMamba]

For data discs, just drag and drop the folder(s) you want to burn and burn them.

For watchable video discs, you need to select video DVD like datdork said. Once you select that, nero will create the video_ and audio_ TS folders for you. Then you just drag the contents of the VIDEO_TS folder that you want to burn into Nero's folder.

In my opinion, springing for the $60 full version is well worth it.