I went through this merry game a while ago.
I had two problems - one that a Microsoft Home Network totally scrambled my desktop and my laptop by changing ownership of drive C (on both) to someone higher than "Administrator" so I couldn't access them or change them back. I had to wipe and reinstall on one machine, but a very helpful person on here (thank you again) put me in touch with someone who helped me to unlock the other.
Since then, I don't go near Home Networks. I use a Work Network which has been sweetness and light.
The other problem was getting the "out" computers to see the printer on the desktop. In the end, I was pointed at the Credential Manager in the Control Panel: that worked fine.