I have PE4.0 running on a 32-bit Dell XPS-420 with Vista. It crashes every time I attempt to burn a DVD with "Premier Elements has stopped working...." message. Here's what I know about the issue:

1. I recently installed SP1 for Vista. I was always able to write DVDs before, but since I haven't done it for a while, I can't tell if the SP1 install had an effect on the problem.
2. All my other applications (Windows Media Player, Magix Movie Editor, Roxio Creator 10, etc.) are able to access and write to DVDs just fine
3. All other features of PE4.0 seem to work just fine.

Any suggestions?

Additional info for DVD crash problem:

I also upgraded Quicktime to the latest release

Roxio could be the issue. Try uninstalling it. Also see this thread, even some of the files the uninstall leaves behind can cause problems:
<http://www.adobeforums.com/webx/.3bc42ca8/3>