DVDFab freezes w Vista Ult 64

I just purchased DVDFab Platinum after testing it on my old XP computer - it worked great. I am now trying to use it on my main computer, a 5-month-old Vista Ult 64 machine. It hangs the instant I start it. If I let it sit long enough (20 minutes or more) it will recognize the movie in the drive (Samsung SATA SH-S203N). If I try to do anything with the program - like copy a movie, it completely freezes then crashes.

I know others use this on their Vista machines without any problems. Is there some setting I need to change or anything else I can check to make this work correctly? Is it the fact that I have Vista 64? Any advice is welcome.

Thank you!