Please help!

Ok, so something is up with my external hard drive, and I am freaking out. Whenever I try to open it through my computer, I get a message saying:
"Windows cannot access the specified device path or file. You may not have appropriate permissions to access the item."
This is total bullshit. I am running Vista (I know). I haven't dropped my hard drive, so I don't think it's fucked or anything, but I'm freaking out because all of my music is on there. Please help!

As incentive, I have nudes of a girl who wanted my cock about two years back. I declined, as I was, and still am in a relationship. However, she sent me a few nudes, and they're on that hard drive...

go to start menu, run, cmd, on the menu right click to run as administrator, con the cmd box enter: chkdsk H: /f/r , enter, yes, let it run and see if it fixes it, you most likely have corrupted files and thats why you get the cannot find file error