BAD_POOL_HEADER on Windows XP

Hello,

is anyone able to explain to me, why on my system i do get a BAD_POOL_HEADER bluescreen stop from Windows XP, right after installing it as Standard-PC (using F5 during Install, selecting "Standard PC ") while having ACPI functions and Plug and Play OS option turned off in BIOS?

My setup:

ASUS P5LD2 Deluxe with an Intel Pentium-4 630 S775 Prescott 3.0 GHz, 800 FSB (Boxed)
1024 MB Kingston RAM (tested), ATI X800 GTO Ultimate Edition (passive cooled), many different hard drives from Samsung and Seagate, all expect for the main setup drive plugged out though.

My system worked fine with two XP setups on two different partitions of the same physical drive. I got a new Audio Interface, so i wanted to resetup everything. First - however - i tried to reinstall the drivers for the HAL (i think it's the HAL, right? which says ACPI-PC or STANDARD-PC in the Hardware List in Windows?), after a reboot Windows didnt start up anymore. It made my computer restart everytime i tried to load up Windows.

I read that when using specific Software (Cubase SX) i shall set the BIOS settings mentioned above to the options also mentioned above. With those settings i tried different combinations (BIOS settings OFF, Windows XP install in Standard Mode, ACPI Mode, then the same with the BIOS settings ON). After a few failures i thought about installing Win2k. This resulted in my system hanging with the text "Setup is starting Windows 2000" on the bottom of the setup screen. Num Lock on/off on keyboard was not functioning anymore, so the system actually seemed to crash.

To give this a structure: my question is simply: how can i install Windows XP on this machine, without using ACPI Support (without setting from ACPI to Standard when already installed) ?

Additions:

All i got connected using USB is a simple Logitech Mouse. This cant be the problem actually, since i installed so often with such devices connected to the computer.

I just tried to install Windows 2000 without setting to Standard-PC mode, but with having ACPI support in BIOS enabled. Same setting for Plug and Play OS. The install worked fine, i got into Windows on initial boot, but when checking the hardware list, i unfortunately found this:

+ Computer
- ACPI Computer


This is exactly what i dont want to have.

Now i tried to reinstall Windows 2000 with the same BIOS Settings, but with setting Standard PC during Install (F5). After loading the setup stuff, it then crashed with the following message: KMODE_EXCEPTION_NOT_HANDLED

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I'd greatly require and appreciate any kind of constructive reply.

Thank you very much.

Leonidas