I just installed vista 64bit on my Early 2008 macbook pro, and the scrolling is TERRIBLE. Yes I installed the drivers, and yes I installed the boot camp update.
I was about to start a thread with something similar. I installed XP on my Macbook unibody. I am also having problems.
What you and I need to do is update our drivers. However, when I select my drivers and hit update, even though they are out of date, it says that there is no new software available.
mine is pretty crappy too, I changed the scroll setting from 3 lines to 1, it's a little easier to deal with.
The touchpad seems more sensitive though... like, I'll rest my thumb on the trackpad in Leopard and it doesn't move, but on OS X it detects every little movement. I often click in the wrong place because if I roll my thumb a little it moves the pointer