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Chances are that  your DNS settings on the client computers where all pointing to the server for this information.  In order to get the clients back on the Internet you need to add a secondary DNS entry. 

Windows XP:

  1. Right click “My Network Places” on the desktop and select Properties
  2. Right click your “local area connection” icon and select Properties
  3. Double click Internet Protocol [TCP/IP]
  4. Enter the secondary DNS IP address (You may need to get this from your IT person or use something like from AT&T]
  5. Click OK and close windows.
  6. You should now be able to surf the web.