Unmountable boot volume.

This error can occur during some Windows XP installations. It can lead to a situation where you can't boot Windows XP, nor can you uninstall Windows XP and revert to your old operating system.

This behaviour may occur if the following conditions exist:

·         You are using an Ultra Direct Memory Access (UDMA) controller with your computer.

·         You are using a standard 40-wire connector cable to connect the UDMA drive to the controller instead of the required 80-wire, 40-pin cable.

·         The basic input/output system (BIOS) is set to force the faster UDMA modes.

To fix the problem, try one of the following:

1.                  Check the file system:

• Start the computer with Win XP CD in the drive (ensure that you have the boot sequence in the bios set to CD-ROM as the first boot bevice).
• Press a key when you see “Press any key to boot from the CD”.
• On the Welcome to setup... screen, press the R key on your keyboard to repair the Windows XP installation using Recovery Console.
• Type 1 when you see “Which Windows installation would you like to log on to <to cancel, press ENTER>?”.
• Type the administrator password when you are prompted to do so.
  NOTE : If no administrator password exists, just press ENTER.
• At the command prompt, type chkdsk /r , and then press ENTER.
• At the command prompt, type exit , and then press ENTER to restart your computer.

-or-

2.                  Replace the UDMA cable.

-or-

3.                  Set failsafe BIOS defaults.

·         Enter Setup during the boot sequence.

·         Load the 'Fail-Safe' BIOS default.

·         Save and exit Setup.