@VyZi: Welcome to the Win-RAID Forum!
I have moved your posts into this matching thread of the "Windows XP" Sub-Forum

Zitat von VyZi im Beitrag #1094

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So I use Easy2Boot to Install these 3

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Which 3 do you mean?

Zitat von VyZi im Beitrag #1094

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Windows XP only wants to install when on RAID Mode for some reason.

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I suspect, that the related BIOS setting is the reason. If you want to install an OS in AHCI mode, you have to set the Intel SATA Controller within the BIOS to "AHCI" before you start with the OS installation.

Zitat von VyZi im Beitrag #1094

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nLite didn't work for some reason (Textmode returned the iaStor.sys is corrupt and I'm sure I've chosen the 86x architecture drivers).

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I doubt, that it was a mistake done by nLite.

Zitat von VyZi im Beitrag #1095

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So I slipstreamed the ExtendedCore16a pack (containing BlackWingCat's fixed acpi.sys) and the right Intel driver with nLite, the Windows 2000 setup throws an error about not being able to load ntkrnlmp.exe, what happened and how to fix this?

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You should better ask the developer of the "ExtendedCore16a" package.
Good luck!
Dieter (alias Fernando)