One reliable open-source tool for securely overwriting and thereby deleting files on a Windows system is the aptly named Eraser. The program can be downloaded for free from various sites.

You will have to open each of these folders and delete all archive files. These files will have a name similar to 00c58c1f-b836-4703-9bcf-c699ca24d285.

If you can delete it, good, else you may need to first disable thumbs.db creation and then try. Read: The action can’t be completed because the file is open in another program.