My Windows XP Professional is missing the NTLDR file. It was deleted by accident. Can I use my new Windows Vista to replace the file in the XP? Also does anyone know what the Bios Setup Utility is supposed to be set to for the XP Professional? I had a friend try to help with the problem and I think he messed up the Bios Setup. Also, when I was given the XP it came with a disk but I do not have the numbers for the code it asks for. Does anyone know how I can get the code? I can not get into the XP Professional because all that comes up is a black screen that says the NTLDR file is missing. If anyone can help with this I would really appreciate the help.