Were going to need some more information. The Read This First..
post tells you what we generally need to know.
Since you were unable to make an ISO file, we know your problem isn't related to the acutal burning process... Apparenty Video Studio is unable to convert your file to a DVD-compatible format...
What format are your audio/video files
, and where did they come from?
The more compressed formats
(WMV, MOV, DivX, MPEG-4, etc.) tend to cause the most trouble.
AVI/DV (13GB per hour from a MiniDV camera) is the most trouble-free format. The same is true with audio. If you are using MP3s (or other compressed audio files), try converting the audio to uncompressed WAV.
If you are using a "difficult" format, you can try using a 3rd-party program such as SUPER
(FREE!!!) to convert your files to DVD compatible MPEG-2. You can look at one of the Video Studio Project-Templates
to find the settings (resolution, framerate, bitrate, etc) for a DVD-compatible MPEG-2 file.