Clearing Screen layout List

I have two items showing on the screen layout drop-down list (blender 2.71). Clicking on them takes me to the file browser screen, where the screen layout list doesn’t show, so I can really delete them. If I click Back to Previous, it takes me to the addons screen. How can I get rid of these two items, or clear the screen layout list?

I just replaced the startup.blend file with one from a previous version I had, and that fixed the problem.