got message 'file is open in another program'

hi in Windows-8 when i try to delete folder i got the message: *"The action cant be completed because the folder or file in it is open in another program"* i check and close all program, i dont see it in the task-manager (if i reset the computer, and try again it will delete it) another problem in Windows-8, when i copy, or delete folder - i cant see the action until i press *F5 for...