Cannot Remove Unilnstalled Screen Savers from Display List

I removed some themes with screensavers buy Right Click on Desktop > Properties > Delete Theme. The Screen Save and other Theme elements were deleted, but the Screen Saver listing still remains in the drop down menu in the screen saver tap.

How do I remove these non-existent Screen Saver listings?

 

The thing is that the .theme file and .scr files were deleted. When Display Properties is brought up and the Screen Saver Tab is clicked and then the drop down Screen Saver selection menu is clicked the deleted .scr still show in the list. Accidentally clicking one of these in the list produces unexpected results.