When you install a new Plug and Play device, the operating system detects the presence of the new device and takes appropriate steps to install it. When you remove such a device, however, the system might not recognize its departure. If the removed device still appears in Device Manager (complete with yellow exclamation point), you can inform Device Manager yourself that the item is gone:
Note that uninstalling a device in Device Manager doesn't remove the driver files from your hard disk.