Replacing PATA with SATA drive on 8KNXP

Mobo: GA-8KNXP non-Ultra v1
P4 2.8C (not overclocked)
2gb Kingston CAS3 RAM
XP-Pro (all updates)

Next week I'll hopefully be replacing my Maxtor PATA C: drive with a SATA
(WD Raptor), cloning with Norton Ghost 2003, and I've run into a snag. I
enabled the "On-chip SATA" (presumably the ICH5R controller) in the bios
(f9) and the RAID function, but XP-Pro didn't pick up any new hardware or
ask for any drivers after enabling these options.

I then downloaded the ICH5R driver v3.5.2.2654 from the Gigabyte site and
ran it, getting the following error message:

Incompatible hardware. This software is not supported on this chipset.
Please select 'Yes' to view the Readme file for a list of supported
products. Refer to Section 2 titled 'System Requirements.'

Checking System Requirements in the Readme file, it states that I must have
a P4 processor and an "Intel 82801ER I/O controller." I also tried the v3.5
driver (for XP only) with the same result.

What am I missing here? Is the "On-chip SATA" the same as the "Intel
82801ER I/O controller"? The SATA drive is expected on Monday or Tuesday
and I'd like to have everything ready to install before that time.

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