dunno, many people with nForce4 boards do not have this on the other hand.
Creative has a procedure in place, I have seen some posting mentioned their knowledge base had some instruction on that.
Let me check
EDIT:
Found it! Their knowledgebase runs some dodgy scripts so I cannot post a valid link, lamesh**!!!,
I copy-pasted article below:
Solution ID # 8804
X-Fi Installation Difficulties
Some computers may exhibit one or more of the following symptoms while attempting to install a Creative X-Fi sound card:
System will either freeze or not boot
System will say there are multiple unknown PCI Devices and then cause the system to generate a blue screen error.
System may reboot repeatedly depending on XP settings.
Error: The BIOS in this system is not fully ACPI compliant. Please contact your system vendor... ( STOP: 0x000000A5 )
These symptoms may be corrected with an updated BIOS from the motherboard manufacturer. To update the BIOS for your motherboard, please contact your motherboard vendor. If an updated BIOS is not available for your specific motherboard, please contact Customer Support for further assistance. When contacting Customer Support, please have your motherboard model and BIOS version available to give to the Customer Support advisor.