Usb Caddy I Have Files On A Hard Drive In A USB Caddy Which Comes From My Own Computer?

I have files on a hard drive in a USB caddy which comes from my own computer? - usb caddy

I have files on a hard drive in a USB caddy that comes from my own computer and has two user profiles are password protected. I was living with my girlfriend and the USB drive connected to your PC. Well, if you open the Documents folder, it says: "Unable to open f: rejected / access / etc etc. Any ideas appreciated!