When booting up to Win XP you may get a error that reads "Unmountable Boot Volume". This is probably because your boot.ini file is messed up.
So, what do you do about it, panic and try to mount your boot in your computer...... No that is probably not a good idea.
You can boot to the XP CD and when you see the "Welcome to Setup" message press the letter R
You will get a DOS prompt.
Then type: chkdsk /p , and hit Enter
When that is done type: fixboot , and hit Enter
Type: Y , and Enter at the prompt.
Then type: exit , and hit Enter.
The system should now reboot into Windows.
If for some reason that does not work for you, you can boot to the Recovery Console as above and...
Type: chkdsk /r , then Enter.
When done type: exit , and press Enter.
This will take longer, but the system should boot back into Windows.
Someone asked about systems without an XP CD , like Compaq and HP. If you have a XP system and don't have an XP CD please download the Windows XP boot disk from the correct link below and use it instead of the XP CD, choosing the correct set for either XP Home or XP Professional.
NOTE: *** The Win XP boot disk takes 6 floppy disks. ***