I struggled with this for a while on a new Vista 64 system. All the answers are contained here in the forum but I found different pieces in different threads. Here is a consolidated list of corrective actions. Hopefully it will save someone's time:

1. Uninstall DVDFab using the uninstaller.

2. Next, assure a complete Uninstall by following (exactly) the directions provided by StormJumper at http://club.cdfreaks.com/2065659-post1.html and be sure to Reboot.

3. Download latest version from www.dvdfab.com (this is the CSS version, do NOT use non-CSS version from www.dvdfab.net). Install after making sure you have Administrator rights on the user account used to do the Install.

4. Request an updated key from http://www.dvdfab.com/retrieveregkey.htm. Be sure to request a v5.x key, not a 3/4.x key.

5. Save the key attachment that was emailed to you, then double-click it to register the key with DVDFab.

- Jeff

...and thanks to all the contributors that did the real work of figuring out the root issues.

Very good advice, just hope more people read it and follow your advice first before posting problems as this would solve a lot I think

Hi Theojt and welcome to cdfreaks,

...Yup, nice job and well organized!
The only thing I see missing (& this is not a complaint, believe me) is Fengtao's registry patch:
http://club.cdfreaks.com/2066229-post10.html

(This patch fixes the continuous loop/crash re: to the automatic update).

This should be a moot point however, for any versions after v.5.0.2.8 Beta...