my only suggestion would be attempt a repair - do you have an original WinXP OS install disk? There's no guarantee this will work, but as you're nearly faced with a complete re-install, it might be worth a try. Also are you running a third party firewall - go into Safe and uninstall it and try reboot.
Check your BIOS is set to boot from CD drive first and make sure Win XP disk in drive. Reboot and hit any key when asked to boot from CD-ROM. Let Windows load all install files and select Install Windows <ENTER>. Dont select the Recovery Console option. The Setup should then detect the old installation and will offer an attempt a repair option <R>. If select this Setup will try to re-instate WinXP as it was with older files.
It might not work too well, but its worth a shot - might give you enough of an OS to actually get a boot and copy off your docs. Sometimes it works perfectly.
Sp2 has issues with some motherboards = Aopen AX4SG, Shuttle SB6IG2, Asus P4P800-E dlx, Abit IS7-V when combined with Prescott CPUs. BIOS update may fix.
Cant think of anything else... maybe this will inspire others to chip in!
Good luck

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