I recently upgraded my gaming system to XP SP3. Upon initial boot I got a BSOD saying my system was not ACPI compliant. I rebooted and went in the BIOS to disable the only relative ACPI option I was aware of, no luck. After further digging I realized I was not alone and this is a well documented problem, with no permanent fix from either manufacturer, ASUS or Microsoft. The only way I can get my system to boot into Windows is to plug in a USB flash drive before POST. I will be downgrading to SP2 shortly. BIOS is version 1405.
http://www.pcworld.com/article/145689/xp_sp3_cripples_some_pcs_with_endless_reboots.html
Notice how this is referenced as an “Endless reboot” problem. That is only because upon receiving the BSOD most systems will force reboot so fast most do not notice the outputted error codes.