'my computer > right click >properties> hardware>device manager (or just use the accessories/system tools start menu item)> pick a device> right click> properties> some tab or another > update driver> choose location"

that's off the top of my head, but you get the idea. it's that annoying screen windows always gives you when you have something you want to install but it asks for a driver. you could just click 'unrecognized device' somewhere, probably too, if it's usb.