“Folder In Use. The action can’t be completed because the folder or a file in it is open in another program”. Temporary impossibility to copy – move – rename, etc. *media files* in Windows 7.
This error seems to occur when quickly editing a file and then trying to use it again. There are numerous programs (including Windows) that index files constantly on your PC and this may be causing the lock. There is a program called Unlocker that will unlock files similar to the solution below. It just seems that this problem occurs mainly with Windows 7, especially when browsing across the network.
Choose any other media file and press “copy”. No need to paste anywhere. The file which was initially locked is now unlocked and can be copied, moved, renamed, etc.