someone has attempted to re-install XP but has 'almost' created a new partition with XP installed on that instead. Only you know the history of this machine, so I can't say.
You will need to edit XP's Boot.ini file, but be careful. Make a mistake and you can lock yourself out of the only working XP.
Microsoft -How to edit the boot.ini file in XP.
There's more practical advice here;
(Note the very last post).
Good luck, and make sure you do the right thing.
I have a 4600 dimension , not sure how this is. but when the system boots up it gives the dell logo screen f-2 & f-12 deal then it comes up please select the operating system to start, both options are microsoft windows XP Home Edition, how do I get this thing to skip this screen and just boot up? What would of been done to cause this? as there are 2 listings and if I arrow down to the second one to tell it to start from it , this comes up.
Windows could not start because of a computer disk hardware configuration problem,
Could not read from the selected boot disk. Check boot path and disk hardware.
Please check the windows documentation about hardware disk configuration and your hardware reference manuals for additional information.