lately I have been recording videos using a screen recorder. they are then stored in the videos folder found in windows explorer. when I delete a file by right click/delete/ok, does this reclaim the space the file used? if not how do I reclaim that space and more by deleting as many files as I need to? does disk clean up tool do that? can I clean up my "c" drive of anything/everything I no longer need without losing the OS? advice please.