Just today I got the following error while trying to move/delete several files:
The action can't be completed because the file is open in another program.
The file wasn't open, but just in case, I closed all programs. When that failed to allow me to move or delete the file, I restarted the computer. When that failed to let me move/delete I came here.
The files can be copy/pasted but move/delete fails even after multiple restarts.
Note sure if this is relevant, but it seems to only be affecting PSD files on my desktop - there are four. But not ALL PSD files.