Unknown device in the list of device manager

My computure is Toshiba, model L645-PSKOJL-00T001 and use Win7 pro.

 the information in the unknown device show as followings: 

"The drivers for this device are not installed. (Code 28)

There is no driver selected for the device information set or element.

To find a driver for this device, click Update Driver."

" No driver files are required or have been loaded for this device"

" Hardware ids: ACPIQCI0701*QCI0701"

I have used windows program to repair this error but no successful

Please help me to repair this error.

Thanks and regards

Nguyen Minh Hai