I used and would get the topic " IAA Raid Edition unattended Install, For Intel 865/875 chipsets"

for the OEM driver installation always this mistake:

unknown mistake (18) in line 1742 in file d:\xpsp1\base\boot\oemdisk.c

Here the source text

[MassStorageDrivers]
    WinXP_Promise_FastTrak_Controller=OEM

[OEMBootFiles]
    txtsetup.oem
    Fasttx2K.inf
    Fasttx2K.sys
    Fasttx2K.cat
    Fasttx2K

Does someone have any an idea?

Try this thread, Prometheus. haven't got to that point myself so can't say if it works.

Installing RAID directly (on WinXP SP1 CD) ?