I went to reinstall vista off the supplied DVD from dell. After I put it in an ran it, I chose to download it onto the C: drive, then after it restarted I got an error message that said: Windows failed to start, a recent hardware or software change might be the case. Then I got an error message that said, The windows boot configuration data file is missing. File \boot\BCD. I selected F12 to boot the DVD manually which it starts Vista but I keep getting the same message. What do I do?