error message” Unmountable boot volume”
Solution:
In XP SYSTEM:

When booting up to Windows XP you may get an error that reads: “Unmountable Boot Volume”.

This is probably because your boot.ini file is messed up. Here is a possible remedy:

You can boot to the XP cd and when you see the “Welcome to setup” message, press the letter R.
You will then get a DOS prompt.
Then type: chkdsk /p [enter]
When that is done type: fixboot [enter]
Type: Y at the next prompt [enter]
Then type: exit [enter]
The system will now reboot into Windows.

If for some reason that didn’t work, you can boot to the recovery console (example above).
Type: “chkdsk /r” [enter]
When done type: exit [enter].
This takes a bit longer, but the system should boot back into Windows.

In Windows 7 OS:

1. Boot from the Windows 7 DVD.
2. Select Repair my computer.
3. Select Command Prompt
4. From the command prompt enter the following command: Chkdsk /R C: where “C” is your boot drive.
5. Answer Y to check the disk the next time that the system restarts.
6. Reboot the system. After the reboot, Windows will check the hard disk and try to repair the damaged area.
7. If you still get the error after this process, repeat the process but try rebuilding the master boot record at the command prompt with the following command: bootrec /fixboot and then rebooting

If your system can be saved, you should now be able to boot back into Windows without a problem!

Related Tags:unmountable boot volume,boot unmountable volume,unmountable boot volume fix