The Error 17: #5 usually means that your NTLM user does not have enough privileges. Please, make sure that you have local admin rights on that machine. In addition, please double-check that admin$ (admin share) is allowed on the remote machine and you have access to it.
The account I am entering for the remote push install is a domain admin account which has local admin rights and the admin share is available from the PC I am trying to push the remote install from. I decided to try it from one of the domain servers and that seems to work. Not sure why it is not working from my PC though.
I was having the same issue/error with providing my administrator account credentials during the remote push dialog. My work around was to run the Remote Utilities viewer as another user, one with administrative rights. Then I was able to select the check box for "Use current security context" when pushing the client out.