[ubuntu] Is it possible to restore MBR to a only-Windows hard disk using Ubuntu?

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http://ubuntuforums.org – Hi, friends. I have a computer with Windows XP installed, and, at Boot sequence, I get "Disk Boot Failure. Insert boot disk and press Enter" message :-(. Of course I can repair this using classic Windows XP Installation CD, but I would like to repair it using Ubuntu to learn the method (you know: "Don't learn to hack, hack to learn ;-)" ), and, in extension, to log remotely (via SSH or telnet) into the computer, so all fixings can be done without my presence. I have tested "ms-sys", but it seems not to be working :-(, even when it says "changes done&q (Hardware)