The above symptom may occur on the following systems:
IdeaPad Y570/Y470 with USB 3.0 plus USB 2.0
1. Remove all USB devices from the Machine
2. Go to Lenovo website http://support.lenovo.com/en_US/downloads/default.page? to locate and download oRenesas Electronics USB 3.0 Host Contrller Driver for your machine.
3. After downloading, run the setup accordingly and restart PC once installation is done.