Yeah, the user is not a member of the sysadmin server role.

The person is admin on the local box for his instance of sql server but not on the domain.

By sysadmins did u mean securityadmin which is one of the server roles?

Nope, the user is not a member of server roles. I made sure of that.

Nope there are no roles granting access to the user, infact there s a deny on the user, evenso it still doesnt work. Th user is not in the db_owner...

I used the command

DENY SELECT, INSERT, UPDATE ON TABLENAME TO USERNAME

The Deny permission doesnt work at all, i mean the user is able to select the requested data, apart...