A good time to renegotiate MS licensing deals?

My local dealer has sold out of bought-in XP systems, and is satisfying demand by assembling their own (desktops). Not so easy with laptops, of course, but it's hard to see why the manufacturers can't revert to what they were doing a few months ago. Or has MS tied their hands...?

I've installed two Vista systems and hit driver problems with both. Also, it reduced high-spec hardware to pedestrian speeds, all for a bit of eye-candy that no-one needs....