While you had to Cannot log on after changing keyboard settings, you can now just configure it.

All you have to do is:

• Open control panel
• open the regional and language options
• go to the advanced tab
• Activate the "Apply all settings to the current user account and to the default user profile"
  
• Press Apply or OK, log off and you will see that the keyboard has the layout you wanted...

The same solution is valid for Windows XP.

If you want to block a ip address in windows Server 2003, you can do this fairly easy by setting an inbound filter for that particular IP address.

Go to the

Administering Routing and Remote Access Service

choose there the  - IP filtering - General - the network connection - properties - inbound filter.