So, I'm trying to install Windows 7. The keyboard and mouse seem to work fine until I get to the Windows 7 installation screen. When I'm there the keyboard and mouse are unresponsive. Like, the mouse light and keyboard lights work up until the Windows 7 screen shows up. Anyone know what the problem is? I've had Windows 7 on it previously and had no issues, but wanted to do new clean install. Any help would be appreciated.