Xp restarts after

Have two PIII 866 installed on an abit vp6. During POST, drive shows. But during OS load the xp logo is never seen, only the -last known good, start normally, etc screen. But any of these choices causes a reboot. The hard drives are ibm deskstars 18GB.

The motherboard has not been updated since 2001 and I can't find an BIOS file on abit's website (there's a link to it but it's dead). Could it be that this version does not support XP?

I cannot find the flash image for the BIOS on abit's website. There is a link under the vp133 apollo chipset and socket 370 but it is dead. Hard drives work fine in other computer.