I created a subfolder in PM. During creation Windows already had issues creating the folder, saying it did not exist and I should rename it. Now the folder (actually 2) shows up in my file structure and cannot be deleted. WIN 10 can't find it but doesn't want to give it up either. Yes, I rebooted, followed various advice on-line (like delete it from the command prompt etc.) - all to no avail.
How did it happen in the first place?
How do I get rid of it?