On the problem machine, run the following scriptlet at a DOS prompt.
code:
break on
'@@UserID = '+'['+@UserID+']' ?
Get $

Post the result.

Do you have other NOS clients and protocols installed? If so, make sure you enable only the required protocol for each client and move 'Microsoft Windows Network' to the top in provider order.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.