Microsoft Internet Keyboard Pro & Vista x64

I've just instalkled Vista Home Premium x64 and downloaded the latest
IntelliType Pro software and found that MS have ditched support for my MS
Internet Keyboard Pro. They have the Internet Keyboard, which is exactly the
same vintage but not mine. The problem is I can only customise about half of
the additional buttons on my keyboard. I don't see why they support one an
not the other, this is unaccaptable.

Is there any way around this?

A related question: Windows Update notified of my a KeyMaestro x64 driver
update for my keyboard - never heard of this, so I declined it - any idea
what it is?

TIA.