I am trying to copy a database from one folder to another. There is no program at all running except operating system.(I mean all windows shut)

I keep getting this :

The action cannot be completed because the file is open is another program

close file and try again

Try again, Try again , Try again .........

what the hell on earth is holding that file and how can I carry on with copy / delete / overwrite files(DB) as this problem is something very common.

Thanks