Sorry, when people start swearing in their help requests it just puts me in a off mood.
Given the purposely vague error message that you received, and that using a trail version of dvd software fixes things, I expect you are having a codec issue.
Unfortunatly if you read the fine print on their webpage http://www.hauppauge.com/pages/produ...a_hvr1600.html
* To use the WinTV-HVR-1600 for TV with the Windows Media Center application, a Media Center certified DVD or MPEG software decoder should be standard in your Media Center PC. If you are building a Media Center PC, check Microsoft's web site for a list of Media Center certified DVD decoders.
Which basically states, that you need to install a dvd decoder codec installed (like powerdvd).
However, I seem to remember that MCE has a dvd decoder codec with it (I could be wrong), to check, this application should work under vista http://www.microsoft.com/downloads/d...displaylang=en