This error indicates that OrangeCD cannot find database in its usual place. Try to locate it manually as scangle suggests; if this does not work, I would search for .DAB files on your entire computer using Windows search facilities - the file may be moved accidentally by someone.

Also check your e-mail, I just sent you more tips.

All in all, things like this don't usually happen out of the blue - something changed in your system - files were either moved, deleted or got corrupted.

Andrei