I have been reading this post. HAL seems to be the real killer to keeping your current version of XP running. I am running a P4 1.8ghz on a 4g4ai (845g chipset) right now. I will be upgrading to a opteron 144 on a ASROCK dual SATAII board very soon. The HAL for my current install is "Advanced Configuration and Power Interface (ACPI) PC". What HAL will my new cpu and motherboard be and will it cause a problem?