Windows 10: Shared folders access problems after upgrade to Windows 10

I have a small network of 5 computers, one of them acting as 'server' to share a folder. This 'server's mapped folder was previously fully accessible to the other computers (Windows 7 Home and Windows 10 Home). Yesterday, I upgraded the 'server' to Windows 10 Pro. Since that time, Windows 10 computers are having difficulty accessing that folder. They are prompting for a username/password (which they previously did not do) and they're not accepting any credentials. (picture attached). What is strange is that it using the current PC as the Domain and still does not accept local user passwords.

I tried setting up new shares but even that asks for credentials and then fails with the same error. Windows 7 computers have no problem accessing that mapped drive.

Help me please!

:)

 

Windows 10 documents

After upgrading from Windows 7 to 10 I cannot access certain document folders. I can access what was in the My Document folders but the Shared Documents folder seems to have disappeared. How do I access these documents?

 

Cannot see other computers other than my own on the network - Windows 10

We have the same problem at our church. Every computer that has been upgraded to Windows 10 or purchased new with Win 10 is now not visible under the Network folder. We can access them by their network path name. Our problem continues because in many
cases we cannot even access shared folders on one of the network computers. For example, on the Sanctuary computer we share a folder in Public Documents. All share permissions are set to Everyone. When we try to access that shared folder from one of the
other Win 10 computers we are denied and no user name and password combination works.