Windows user have full effective rights from his computer

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http://serverfault.com – We have a Windows 2003 single domain. A share located on a server have full rights for every authenticated users. Under this share, a folder is read-only for everyone (except Administrators group). Everything work as intended. I discovered one user who, from his Windows 7 pro workstation, have full access on this folder. He can do whatever he wants. If he log on another computer, he have read-only access. When I display effective rights for this user FROM his workstation, I see he have every boxes checked. When I display the same thing from the server, I see correct rights. This user belong (HowTos)