UltraVNC

i tried removing the authlogonuser.dll , the auth.dll is already in the directory, and restarting the machien to make sure the service isn't using the authlogonuser.dll somehow and i get an error "you selected ms-logon but the auth.dll was not found, and it hangs up the ultravnc client as well.

I'm ...

i removed the dll to see if i could skip the local authentication and the program complained looking for auth.dll. how can i "uninstall" this particular dll.