Did you just install the device?
I need more information please.
Start with going to device manager, remove the device, and reboot and let windows auto detect the device, and let windows choose the proper driver for the device. If that doesn't work, you will need to remove the device, and edit the registry to remove all instances of the device. Make sure you back up the registry before you make any changes, and be VERY careful not to delete anything other than entries related to the drive in question.