well my sisters computer was the main one used in the house, becuase it was the only one connected to the net.... but one day after shed used it the night before whilst i was working i came to start it up, but i got the "NTLDR file is missing" error message... n i knew some files on the windows were corrupted so i formated the hard drive, but im still getting the same error message..... and now i have no idea how to get the NTLDR file back so i can install windows xp once again and get her computer working