I'm logged as an administrator on both computers.
I can ping from each computer to the another, by IP address OR by computer name.
I can mount a share (NET USE command) of one computer from the other computer
The NET VIEW command followed by a computer name on each computer correctly lists the current or the other computer shares

But :
On the WINSRV2008 and WINSRV2003 computers, the NET VIEW command without any parameter says : "System error 6118 has occurred. The list of servers for this workgroup is not currently available".
In the Windows Explorer / My Network Places / Entire network / Microsoft Windows Network of the WINSRV2008 computer, I don't see the workgroup name but of list of two computers including the VM host (Windosw XP SP3) and the WINSRV2008 computer only (not the WINSRV2003 computer)
In the Windows Explorer / My Network Places / Entire network / Microsoft Windows Network of the WINSRV2003 computer, I see the workgroup name, but, when I click on it in order to see the computer names, I get the error message "WORKGROUP is not accessible. You might not have permission to use this network resource. The list of servers for the current network is not available."

On a few Google solutions I found and tried (without any success), I have seen that the netlogon service should be started on the computers, but when I start it, it stops saying it has nothing to do (may be because I'm not in a domain).
I have no malicious softwares and the administrative shares ($shares) are all visible.

So, what is wrong on my servers ?
Why do I not see the workgroup and its computers, while the shares are visible and connectable ?

Thanks for your help.

Klaus