Hi,
I think you should process this way:
1) Get an usb drive (hard disk or flash disk)
optional: have a big, strong cofee near you !!
2) download bart's pebuilder, link here:
http://www.nu2.nu/pebuilder/3) Get an SP1 XP CD (no key needed)
4) Make a bootable ISO with PEBuilder, burn it on a CD
5) plug in your usb device
6) boot on the PEbuilder CD
7) Recover your data !
one other way:
2) plug in your usb drive
3) boot on XP CD
4) select "repair" then select "recovery console" (some words may not be the exact ones: i translate it from french)
5) You'll have a sort of dos prompt
6) recover your data
warn: this is a "sort" of dos prompt, not exactly a dos, very sensible with wildcards (*.*,??)
and now you can pray !!, good luck !