How to start the system using "System Restore to Restore" in Windows XP?

If Windows does not start, 

• Press restart  button
• Then press the F8 key when Windows begins to start.
  Windows Advanced Options menu will appear.
• Use the ARROW keys to select Last Known Good Configuration (your most recent settings that worked), 
• Press ENTER.
• If a boot menu appears, use the ARROW keys to select Microsoft Windows XP, and then press ENTER.