Setting the Signup Client to boot into Windows

Is there a way to configure the Signup Client so that it boots back into Windows, without uninstalling the Signup Software?

Yes, log in as the system administrator and can edit the following Registry Key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

Change the setting for the GINA from NTGINA (which Pharos uses) to MSGINA (which Microsoft uses).

Change back to the NTGINA and Signup will start again.