An unmountable boot volume error suggests that you may have a hard disk failure or at least some corruption to the hard disk which the system uses to boot Windows XP.
To try to resolve this problem you would need to use a specialist boot CD to try to repair the disk errors. One such disk is
Hiren's Boot CD which can be downloaded as a CD image file (.ISO) then would need to be burnt on to a blank CD then the computer booted from this CD.
On the initial Hiren's boot menu, select DOS programs, then select Disk tools before selecting HDAT2 to perform the disk repair actions.
HDAT2 can take some time to complete depending on the size of your internal disk drive and the number of bad sectors or other errors encountered - the tool will attempt to repair bad sectors by reading, verifying, writing and re-reading / verifying the data.
If the disk can be recovered, then you may be lucky and the system will be able to boot but otherwise, you may still need to do some further recovery work for the operating system, in which case you may need a Windows install CD or other recovery CD media.
If HDAT2 finds a lot of unrecoverable errors then you should seriously consider replacing the drive - you should be able to recover data from the old drive using other tools on the Hiren's Boot CD, including booting the CD mini-XP environment and using the tools there too.
That is the first thing I did and it did not work. I think the drive itself is bad... I just cannot see how to get it apart and replace it.
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