Hmm, I may have jumped the gun with my original apraisal here.
All I said about the game DIRT still stands but I have now managed to get the GRID demo working within Vista.
First I used the X Box controller instead of the Logitech pad and it worked straight off (I did load the latest drivers from Microsoft prior to connecting it).
Disconnected that and tried the Logitech gampad controller again, still wouldn't work.
Loaded latest Logitech gamepad drivers and it worked within the GRID demo.
Oh crap. That simple it was. Latest drivers
And this game is great, a real sense of reckless speed. Will probably buy this when it's released. Even considering a steering wheel....
And just by way of mentioning, the Logitech Cordless Rumblepad Mk II has better control qualities than the X Box Controller, in my opinion, which I must confess surprised me.
But it is a marginal difference, there's hardly diddly squat in it.