I have build a my own credential. I Installed it on 64 bit systems with Windows 7 home and it's ok. I tried to install it on 3 different machines with windows 7 64 pro and my provider is not shown.
I didn't know that there were differences in windows 7 version about credential provider.
I don't know what to try to solve problem. I tried to install a commercial Provider (aloaha, rohos) and they are ok, I tried to install microsoft samples ( 64 bit compiling) but they are not shown.
In windows 7 home premium 64 bit all is ok.