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Assuming you have tried other usb ports and had no change,remove the usb connection, then go back into device manager and select the usb controller, right click and select delete as this will erase any input driver the usb port recognises.
Restart the pc and then the controller should be reinstalled automatically as it sounds as though the controller has become corrupt for some reason.
Go back into device manager and check there are no exclamation marks, reconnect the drive and see if it's recognised.
this problem is due to usb driver not properly installed. do one thing plug that device in another pc and watch whether it is recognised or not. if it recognised then u will have to install usb driver from ur motherboard cd and if not that then u need driver for that device to work properly in ur pc and u get that driver in the device manufacturer cd or website. for this search go to www.google.com.