Win 7 pro sends incorrect username when attempting to connect to another machine on lan

Under 'Network -- when typing name such as \\computer0:
Cannot successfully login/join/access xp pro machine on lan under win 7 PRO sp1 (\\computer1) but CAN do so under win 7 home premium sp1 (\\computer2).
Looked at credential manager (on both computer1&2) and entries for \\computer0 are almost identical. Successful machine shows username: \\COMPUTER2-MACHINE\myusername and unsuccessful PRO machines shows username: myusername. Passwords are correct and
the same.
When I created a new entry on \\computer1 as 10.0.0.11 for \\computer0 and added the same username and password, it DOES logon/connect/access computer0.
I am certain the username is being passed incorrectly as the currently logged on user on computer0 rather than the user name defined in credential manager.  I have run Wireshark on computer0 during the failing computer1 attempt to access \\computer0
AND during the successful access by \\computer2 to access \\computer0 AND when \\computer1 successfully accesses computer0 via using \\10.0.0.11  The username in the security blob | ntlm secure service provider ... is clearly shown to NOT be what is defined
in credential manager.
Any thoughts? suggestions?
tia,
Steve

Hello Andy,
Thanks for your suggestion.  I tried it.  No luck.  Same situation. CAN logon to \\10... but not to \\computer0
I deleted the entries. Rebooted. Tried access to \\computer0. Failed. Created credential. Tried. Failed. Tried \\10... Failed. Created credential for 10... Tried. Succeeded.
Can you tell me how I can completely delete the credentials?  (It's a recently purchased used laptop and not much of mine installed on it yet.)
Are there any 'reserved word' credentials that might conflict with my 'computer0'?  It's real name is \\ma785gm after it's motherboard.
Thanks,
Steve

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