Can't move files - In use warning

Whenever I try to move a folder to another folder, I get "The action can't be completed because the folder or file in it is open in another program. Close the folder or file and try again."

I know the files aren't open in another program,  in another location or by another user. I have full permission to the files and folders. If I leave them alone for a couple minutes, windows will allow me to move them where I want.

Any ideas?