Microsoft Remote Keyboard (for Windows XP Media Center Edition)

I really liked this keyboard, so brought it even though its now a deleted line...
It also uses infrared instead of bluetooth or wireless which I wanted. But I can't seem to get it to work? I have been able to confirm that it does work, as I have achieved the following:
It has 3 programable keys
- Volume up
- Volume down
- TV power
I have programmed these keys successfully, and they work as intended, confirming to me the keyboard is working, sending Ir signals...
And the volume keys, instead of using the volume control from the TV remote, I used the volume control from my iMon remote, and that works, so I can confirm that the built-in Ir reciever is picking up the signal and working as intended
I have read on the Microsoft support pages and product pages that it works with Vista MC as well, so that should not be the issue.
The update: 'Update Rollup 2 for eHome Infrared Receiver for Windows XP Media Center Edition 2005' appears to be an update for XP only, as I have tried this and does not work with Vista, I am guessing as its already uo-to-date.
My guess has always been that I need some software or drivers of some kind to get this keyboard to work, but I can't find any, that my Vista system will let me install?
Can anybody help, tell me where I am going wrong?
How do I get this keyboard to work?