Getting Parallels Desktop for Mac 12 to Learn Windows 7 Password

I somehow installed Windows 7 (32) guest OS without a user password. I reset a new password in Windows but now the VM doesn't log in on launch and Windows announces bad password and I have to input the password manually. How to teach Parallels Desktop for Mac the new Windows 7 password so it launches without the extra prompt? My Windows 7 (64) guest OS launches without the extra prompt with a non-null password.