Wife's PC asks for password on home network.

She doesn't use a password to log on to her Windows 10 PC. Her user name is her email address when the "Enter Network Credentials" window pops up when access is attempted from other computers. Her email password does not work here. We don't know what password it might be expecting. We've run NETPLWIZ on her machine and cleared the "users must enter a user name and password" box. This has no effect.

Anyone know how to get around this problem? TIA.

In the Network Sharing Center | Advanced Sharing Settings | All Networks section you can turn off password protected sharing. That did the trick. I don't know what the stuff in NetplWiz is all about.

The NetplWiz app is for configuring login options on that local machine. In your case, it was asking for passwords on the remote system when you configured the sharing. I'm not a big fan of leaving accounts open with no passwords. My wife and I each have an account, and I put the same username and password combination on every system in our house.