MacBook :: Trackpad / Touchpad Not Working (at All) Under XP SP3

I've installed XP sp3 on my macbook, works great....except the trackpad. Most common problem with the trackpad (in other threads) is slugish response or whatever, but not here: the device just does not work at all.

These are the symptoms:
- no life in the touchpad device
- device manager shows an exclamation mark on the touchpad and says it wants me to update the driver (after enabling). This does not help a bit,I tried all the decision paths after right clicking it, include downloading some driver from the internet and pointing the operating system to this driver: no avail.
- accessories->system tools->system information: signed drivers does not even report something looking like a track or touchpad.
- updating to bootcamp 2.2 didn't bring anything.
- often threads (mostly about the trackpad being sluggish) endup pointing to the 1.1 update [URL], but something not available cannot be updated...so doesn't work
-under the apple operating system it works great.

Probably nothing to do with this, but my motherboard was replaced a few months ago (under warrenty), can they have forgot to hook something up there? I never tried XP before that repair on this machine.