Because of failing in installing Debian on my Desktop PC on which the Windows Xp operating system already exists, my computer now crashed,that is, since the MBR sector has been unsuccessfully overwritten, the computer cannt boot of itself. I think there might be something wrong with the Debian Installation DVD or the DVD drive, more chance is the DVD drive,since all the hardwares are new and havnt been tested. My question is how to fix the MBR so that it could still boot Windows Xp, or how to install NT Loader onto the MBR sector under Knoppix? Please notify me ASAP if you guys know the answer. Thanks in advance!