I guess you can tell my problem.

I've downloaded some videos. I'm trying to move them to a folder, but I can't because Windows is telling me there is a sharing violation! What the heck is it talking about? I'll highlight about 15 files, drag and drop, and it'll have a problem with 3 or 4 of them. The files aren't being used as far as I can tell.

Is there a way to tell what they are being used by, or to manually break the connection to whatever it is??