windows 10 computer cannot access window 7 computer and visa versa

I have 3 laptops that were running Win 7 and all seeing each other. I upgraded one laptop to Win 10. I can access one of the other laptops but cannot access the other laptop. When I try to access the Win 7 laptop from the Win 10 laptop, it asks for user name and password but does not accept the admin user name and password of the Win 7 laptop. All 3 laptops have the same admin user name/password. I followed John Hurst's Folder sharing on modern machines: but that did not help.  Any ideas?
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JohnBusiness Consultant (Owner)Commented:
Same networking structure in all of them.

Make sure (Network and Sharing Center) that all Network cards are set to Private (not Public). Make sure Network Discovery and File and Print sharing are both ON. Make sure Homegroup is OFF if you are using traditional sharing.

Read my article on Folder Sharing for helpful hints and ideas.

Sorry - I did not read far enough and see you already read the article.
JohnBusiness Consultant (Owner)Commented:
Double check that network cards are set to Private. You may need to delete the Windows 10 Profile and make a new one. Windows 8 and 10 do not allow you to change the network type easily - Windows 7 does.

I am syncing my Windows 10 laptop with my Windows 7 desktop so the connections can work.
JohnBusiness Consultant (Owner)Commented:
Also (as I don't run across it much anymore), make sure all machines are on WORGROUP and that Firewall rules are not blocking traffic. Disable firewalls temporarily to check.
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JoeSystems AdministratorCommented:
Also insure that there is a rule in the firewall to allow traffic between the two. I would temporarily disable them to see if that's the issue.

JoeSystems AdministratorCommented:
These are the ports that should be open.
JohnBusiness Consultant (Owner)Commented:
Unless they were closed, file sharing normally works between computers.
JoeSystems AdministratorCommented:
True but it's worth looking. Just a check mark.

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thenelsonAuthor Commented:
Because of this problem and some other problems, I downgraded the computer back to Win 7 which made the computer totally unusable as the keyboard, mouse and network stopped working. You can see the question I created on that problem: When I get some time, i will have to do a clean Win 7 install on it. It looks like Win 10 is about as reliable as Vista. I wouldn't recommend it.
thenelsonAuthor Commented:
Thanks for your help.
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