I'm new to this site and know enough about computes to be dangerous. I teach electronics for disabled Vets and we bought 5 new toshiba's for myself and new students that came with windows 8. For whatever reason, our IT guy loaded windows 7 on them and since then my toshiba (sattelite c55d-a5107) has had loads of problems. I can't "extend display", & the sm bus controller, ethernet controller & usb2.0-crw have "!" next to them. We've tried to download the drivers from toshiba, but they made no difference. HELP!!!!