- What exactly do you mean with "install'? I just plug it in the USB-2 or (if it is a USB-3 disk) the USB-3 port.
- What exactly do you do get that message after you "installed" it? What program gives that message?
- Can you read the hard drive in another PC/laptop?
- What does WINDOWS DISK MANAGEMENT (google that, if you don't know how to run it) say about the disk?