Another member a few days ago posted he had a problem and he posted how he fixed it. Now if you did a forum search you would have found his post. Anyway here is what he posted
[B]Registration problems - fixed[/B]
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:
[B]1.[/B] Uninstall DVDFab using the uninstaller.
[B]2.[/B] Next, assure a complete Uninstall by following ([B]exactly[/B]) the directions provided by StormJumper at http://club.cdfreaks.com/2065659-post1.html and [B]be sure to Reboot[/B].
[B]3.[/B] Download latest version from www.dvdfab.com (this is the CSS version, [I][B]do NOT use non-CSS version from www.dvdfab.net[/B][/I]). Install after [B]making sure you have Administrator rights[/B] on the user account used to do the Install.
[B]4.[/B] Request an updated key from http://www.dvdfab.com/retrieveregkey.htm. Be sure to [B]request a v5.x key[/B], not a 3/4.x key.
[B]5.[/B] Save the key attachment that was emailed to you, then double-click it to register the key with DVDFab.
…and thanks to all the contributors that did the real work of figuring out the root issues.