I have had a peer to peer win network for several years.
one of my machines had a two hard drive boot 32 or 64 bit depending on the boot drive.
I finally made the jump over to the 64 bit op system and spent the 2 week ordeal of installation, quirks, and general messes.
Issue this machine does not WANT TO PLAY NICE WITH OTHERS.
yes every setting appears to be the same as the others.
I stay away from wizards (and witches)
No need to go into check the homegroup etc.
we had found two keys in the admin module a couple of years ago that stopped all this.
local security policy>local security policies>Security Options>
lan manager attenuation level .. set ... send LM & NTLM - use NTLMv2 session...
LDAP client sign requirements ... set ... negotiate signing.
this has done the trick for several years on the dozens of machines that have past through this house.
I get the famous... windows cannot access \\pc-64 ect....
which key... is buried down there... I have 6 computers that all talk to each other... this guy can talk to... but he wont let them talk to him...
its in there.. but where....