*Unplug the USB device. It is possible that the connection is not secure and has become loose. This is one of the most common reasons for an error in detecting a USB device.

*Use the Device Manager to scan for new and recently installed hardware. From the start menu, select the 'Run' option. In the pop up box, type in Devmgmt.msc and then click 'Ok'. From the 'Action' Mmnu, click 'scan for hardware changes'. This will make Windows recognize any new devices that are installed. Now, close all device managers and control panels. Now see if your computer will read the USB device.


If that doesn't work, here is another option you can try:

Disable power management of the USB hub. To disable the power management on the USB hub, follow these steps:
*Click Start, and then click Run.
*Type devmgmt.msc in the Open box, and then click OK.
*Expand the Universal Serial Bus controllers' node, and then follow these steps for each USB Root Hub that is listed:
*Right-click the USB Root Hub and then click Properties.
*Click the Power Management tab.
*Click to clear the Allow the computer to turn off this device to save power check box, and then click OK.