Unable to see T60 on my network

I see others have reported a similar problem but none of the remedies work for me.
I have a T60 and a Z61t.  Initially, neither one could be seen on my network but they could see the other PCs.
On the Z61t, turning off the Network Security settings in Access Connections resulted in it working.
That did not help the T60.
I have tried every combination of Network Security settings including unchecking Network Security.
The problem exists even without McAfee Security installed and with Windows firewall turned off.
All PCs can ping the T60 just fine and vice versa.
The T60 can see all the other PCs and access their shared drives.
It can access the internet and my email servers just fine.
The results are the same for the wireless and ethernet connections so it must not be a hardware problem.
In other words, the T60 appears to work just fine from its point of view.
When I say "cannot see" I mean the other PCs do not see the T60 in My Network Places -> Workgroup
and Explorer -> Find-network-computer cannot find the T60 by name.
All the PCs are in Workgroup = WORKGROUP according to their System Properties dialogs.
I figure something in the ThinkDisAdvantage must be intervening some place... but what?
It acts like a total firewall block on inbound traffic.
I have literally hundreds of hours invested in the configuration of the T60.
I am beginning to think my only hope is to pitch the factory load and install XP from scratch (or sell it).
This is by far not the first problem I have had with the Lenovo add-on software hosing things.
I keep thinking I'll finally get over the last hurdle.
Does anyone have any other ideas I might try or things to check?
I should add that the T60 and Z61t both have the client security chips disabled and both have
fingerprint readers that are not configured.  I am using standard logon accounts.
I do not know enough about how IP works to have any idea how to diagnose what might be blocking it.
Thanks.

Finder > Applications > Launchpad.
Drag it to the Dock.

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