More often than not when a device isn't working it is because the driver has become corrupted. Re-installing a fresh copy should help
Completely remove the current driver and install the newest driver available. For instructions on how to do that Read all about updating drivers by my partner JMH3143 here http://answers.microsoft.com/en-us/windows/wiki/windows_other-hardware/updating-a-driver/a5e6345e-af9b-4099-bef0-8d22254aa1c1?tm=1436753520149