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Thanks to Google (and google Chrome, my browser) i've found an answer to my pray
I'll just copy/paste below the solution that worked for me:

Here's how I got AHCI working with ICH10R on an XP SP3 32bit install, Asus P5QL-E motherboard, Samsung F1 SATA drives, Optiarc AD-7200S SATA DVDR.
NO XP reinstall or registry hacks needed, just updated drivers, it just took a few minutes.

Backup system first.
D/L Intel Matrix F6 floppy creation s/w.
Create the F6 floppy and copy the several files to C:\AHCI. Also copy one of them, iaStor.sys to Windows\system32 as well (not sure if this is strictly necessary, I think it may stop an error message though).

In Device Manager's IDE Controllers section, right click and update driver on 'Intel ICH10 Family 2 port serial ATA Controller 2-3a26'. Use the options 'Install from a list or specific location', 'Don't search, I will choose the driver to install' and navigate to C:\AHCI and choose iaAHCI.inf as directed. Don't reboot.
Do the last bit all again for the similarly named 4 port driver and choose the default .inf file as offered. Ignore all warnings about the drivers not being compatible, this is true because the drives are currently in IDE mode in the BIOS.

Reboot and go into BIOS to change SATA drive mode from IDE to AHCI. Go into Windows, there should be no crashes.
XP finds new hardware, reboot again and all done.

In Device Manager, the IDE section now has one driver, 'Intel® ICH10R SATA AHCI Controller'.