Why does not transparent logon work on the target server with Windows 7 S.O? even though the target account is configured correctly.
Which release of CA PAM are you using? I do not believe we officially support Windows 7 for the Transparent Login feature. You can take a look below for further clarification (I provided documentation from 3.1.1):
RDP Connections - CA Privileged Access Manager - 3.1.1 - CA Technologies Documentation