I have a Logitech mouse and I installed all the latest drivers. Big mistake. Now, it doesn't give me the option to decide how many lines are scrolled with each notch of the scrollwheel. There's no option to do this in the new mouse options. Totally lame. I'm going to completely uninstall all this Logictech Mouseware crap. You don't need it. The mouse worked fine when I plugged it in straight out of the box, I just figured that installing proper drivers would be the best thing to do. I was wrong.