Try the discs, see if you can boot it if it is a recovery, or just try to run it and see your options. You may need to find a copy of an XP CD in order to reformat it.
http://helpdesk.its.uiowa.edu/windows/instructions/reformat.htm Theres some help if you do happen to get your hands on a cd.
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Inferno Package/CAI/180tstat/3" DP/AL 104 XP's/3.8 MPS/Tuned