I has problem don't know how to fix Windows 2000 Pro login problems and somemore my brother know how to hack system override my Server Domain & Security Policy setting without his account has been disable.
So really dun what do. I really have big problem to me.
He is probably logging in with cached credentials. If you are using AD you can disable logging in under cached credentials. If not, try editing the local security policy and disabling cached credentials on the local machine.