Ah, i thought you already knew this, eva. I already have post this issue in DFI forum.
When i install Windows XP x64 (SP2) in my rig, everything is fine until i try shutdown or reset the system. Shutdown -> power on leads to 88 code, board dead. Reset leads to system hangs, FF code and blank screen. Only reset cmos with jumper or unplug and replug the PSU wire restore the system. The workaround that solve this problem is play with pcie roots settings.