Windows Popping Enter Network Credentials

Problem: I have 8 computers and 5 laptop on a home network and all of a sudden my laptop cannot connect to the PC with the printer attached to it. Every time I try to print I get an error message so I checked and when I try to access the PC from my laptop through the network it keeps asking me to enter a password.

The Windows 8.1 machine was the problem. I went to the

CONTROL PANEL, then to
NETWORK AND INTERNET, then to
NETWORK AND SHARING, then to

ADVANCED SHARING SETTINGS, then

HOME GROUP CONNECTIONS - I changed it from the "recommended" setting of
ALLOW WINDOWS TO MANAGE CONNECTS

and instead choose
USE USER ACCOUNTS AND PASSWORDS TO CONNECT TO OTHER COMPUTERS

Instant SUCCESS as all the other computers share directories were instantly available.