You want to improve the TCP transmission speed of a Windows 2000 Server computer. You also want to remove an unused registry key. You use Regedit32 to edit the registry of the Windows 2000 Server. You insert a value in the registry named TCPWindowSize, and you remove the unused key. You restart the computer, but the computer stops responding before the logon screen appears. You want to return the computer to its previous configuration. What should you do?