WHEN I START MY WINDOWS SO IT SAYS NTLDR IS MISSING PRESS CTRL+ATL+DEL ?

The NTLDR file of Windows is corrupted, so it doesn't boot to take you to Windows. Boot your computer from Windows CD and start Installation. After Pressing F8 it will ask you if you want to repair your previous Windows. Just press R to repair it. Your files and installed programs will not be deleted.