My wifes hard drive crashed so I got her a new one. I did a fresh install of windows XP Professional. Everything went great. Got all the drivers downloaded and installed. The system was working great. She shut it down for the night and when she started it up the message ntldr not found. hit ctrl+alt+delete to restart. I tried formatting the drive and reinstalling but the same thing happened on reboot. How does this happen and how do I fix this issue?