If you moved the files in %Appdata%\VoiceAttack, you should not have been asked to re-register.
If you moved the files in %localappdata%\VoiceAttack.com, however, that would have required re-registration.
Make sure you moved the files in %Appdata%\VoiceAttack, specifically. There should be "Backup" folder, a "VoiceAttack.dat" file, and possibly a "VAEffects.dat" file.