I was reading the forums in Creative and it seems there's a problem with installing X-Fi Xtrememusic cards where Windows XP detects it as "Uknown PCI Device" and assigns them to IRQ 29 during the bootup process.
Then there's another problem where a message appears saying the BIOS is not ACPI compliant and tells you to update your BIOS.
Apparently, they're many X-Fi Xtrememusic owners who have this problem, and Creative is still trying to figure this problem out.
For those who own X-Fi Xtrememusic and has this card, here's the link to follow up:
Software and configuration issues are par for the course with Creative.
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