We have a domain served by some Windows 2003 servers.
We have several Windows 7 Pro clients.

ONE client computer can't acces ONE member Windows 2003 server.
The other computers can acces every servers. And the same computer can access other servers.

With explorer, the message says the account is no activated.
With the command line, the message says the account is locked.
With commande line :

net use X: \\server\share
--> several seconds delay, then error (says the account is locked)

net use X: \\server\share /USER:current_username
--> okay

net use X: \\server\share /USER:domain_name\current_username
--> okay

From the same computer, the user can access other servers. From another computer, the same user can access any server, including the one denied from the original computer.

Aleady done :
unjoin then join the cilent from the domain.
check the logs on the server : nothing about the failed attempts (?!)

Is their any user mapping I'm not aware of ?