Technically, you don't "capture" from a DVD. You rip the file to your computer using the Video Importer.
Can you describe the steps you used to get the video from the DVD into your project?
Which project settings did you select when you set up your Premiere Elements project?
Did you allow the program to fully conform your files before you started editing?
With a DVD-Video, you are only concerned with Importing the VOB files, which contain the spanned MPEG-2 Video and Audio. This ARTICLE goes into much more detail, and also lists some cases, where Import will not function properly.
Where did this DVD come from, and what software/hardware was used to produce it?