Server 2003 Login Problem

The Server 2003 is a DC. I cann’t login to the server either at site or remotely, everytime it’ll hang at the portion “Applying Computer Setting”, no matter which user account i used, even the built-in administrator. There’s no problem to browse the server content remotely. I can only login by safe mode, not even the Directory Service Restore mode. I’ve tried to use the Last Known Good Configuration, it’s still don’t help.

My network is isolated from internet, so it’s not the virus or spyware problem. The server is running MS SQL2000 & Syspro Accounting.