Trying to install W7 on a new Asrock AB350 Pro 4 mobo. Keyboard/mouse works in BIOS but as soon as the usb W7 installation starts the mouse/keboard wont work and I cant move past the initial screen to install windows. I tried plugging usb mouse/keyboard into usb2 ports I tried using the round adaptor for the mouse/keyboard. Doesn't work. I read about setting the xhci to disable through bios but cannot find that setting anywhere as well as anything relating to usb legacy settings. Anyone with a workaround or a current Asrock mobo that can tell me where the hell these settings are??