Strange Folders Appearing in Win 10

Hi folks

I've had a problem recently which I can't understand. In Win 10 Home I have three HDD, C, E & F. Each time I open up there is a folder at the start and finish of each of the drives containing files like the four I have downloaded. I don't recognize them and can't understand where they are coming from. Any ideas please and what can be done about them. They can be deleted but come back with a different name of folder each time.
Hope you can help.
Kind regards
Rev Gerald