You don't.
Pop along to both www.microsoft.com & www.intel.com
Search the white papers and have a read about ACPI.
 
ACPI, amongst other things, has been deisgned to make the installation of computers and future add-in cards easy and very staright forward.
No more worrying about lack of IRQ's, no more having to put cards in certain slots - with ACPI, all devices 'appear' to sit on a single IRQ, in fact they are usuing virtual IRQ's, this is how we get around the 16 IRQ limit, with ACPI we effectively expand those original 16 to 256.

If ya think ACPI is a problem, you're mistaken. Very rarely is it an actual problem, but gets blamed frequently. Speaking from experience, ACPI is best left alone or bad things happen---along the lines of completely reinstalling the OS.

I had really really big problems with ACPI in XP and W2K. If i installed nvidias detonators it would crash and hang every time. Cpu usage went from 0->100% all the time. After uninstalling ACPI the problems were gone.

sometimes you get problems with a badly configured system. If your system is configured properly including BIOS then you shouldnt have any problems.