How-To Logon Screen and Vista

Hey volks, ive got a big problem,
i just installed my new vista
and got it run so far...
but i only get the boot screen
changed...
when i try to start "LogonStudio"
it says:

-->
LogonStudio is no more registered as Logon
screen Editor
Do you want to register it?
(If you choose no the program will exit)
<--

but it doesn't matters what i do,
it will not start by error:

-->
Run-time error '75':
Path/File access errror
<--

anyone solution?

greets jonas