dupes:
http://askubuntu.com/questions/127418/im-having-trouble-installing-the-nvidia-proprietary-driver-with-the-geforce-gt5
http://askubuntu.com/questions/127409/usb-very-slow-in-ubuntu-but-works-good-on-win7
http://askubuntu.com/questions/127418/im-having-trouble-installing-the-nvidia-proprietary-driver-with-the-geforce-gt5
http://askubuntu.com/questions/127409/usb-very-slow-in-ubuntu-but-works-good-on-win7