Here's what worked for me...AFTER running "Network Reset" on the stubborn PCs...I ran the fix that was posted by New Guy_1...here's a copy of what New Guy_1 posted:
NG
New Guy_1
Replied on February 6, 2025
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I can see other computers on my network but I have no access. I've checked all of the network settings. This all happened right after the windows 11 24H2 completed. I updated all the computers on the network and still no access.
Thanks,
Steve D.
problem solved for the Windows 11 24H2 update.
to allow access to your folders, the following works (after I tried every other thing that doesn't)
go to Start, type Powershell, Right click on Windows Powershell, and Run as Administrator.
Enter these commands one at a time, and Enter.
Set-SmbClientConfiguration -EnableInsecureGuestLogons $true -Force
Set-SmbClientConfiguration -RequireSecuritySignature $false -Force
Set-SmbServerConfiguration -RequireSecuritySignature $false -Force
These worked on a brand new install, and after the update.