Well technically we're not supposed to talk about NOCD cracks and stuff like that because we don't host this website. However, you're not asking for advice on how to get a NOCD crack as you obviously already have one.
The good news is that TFN never touches the vampire.exe file but does overwrite the vampire.dll file in \Vampire\dlls\. What I would recommend, is make a backup of your vampire.dll file, test the crack, and if it works, GREAT! If it doesn't, then put the old .dll back.
I have a feeling that you can probably get away with using the crack's .dll file and not ours. Give that a shot, it will probably run TFN just fine.