Win7 does not recognize usb device troubleshooting

                                                                                                                                                                                         

Now most keyboards and mice are USB interfaces, which are not only convenient, but also support hot swap.

But when the computer
appears on the
the device does not recognize the ” the words are very troublesome, then win7 can not identify the usb device, what should I do?

1. Right click on the mouse and click on "My Computer" to select "Properties".

2. Select "Device Manager" in the pop-up system interface. ;

3, open the device manager, find "Universal Serial Bus Controller" open, there are several "usb root hub" options

From the first one, double click the mouse to open, pop-up "usb root hub" dialog box, click "Power Management",

in the "Power Management" interface, will "allow Computer
Turn off this device to save power & rdquo; option in front of the tick off, click & ldquo; OK & rdquo;

in turn, all the "usb root hub" in turn, after the above method, restart the computer. You can solve the problem