There are 11 screensavers and "(None)" in the Desktop/Personalisation/Screen Saver list. Some of them were added by software installed since the operating system was installed. One of them was made with Axialis' Professional Screen Saver Producer.

In the System 32 folder there are only 7 screensavers, 3 of which have identical names to corresponding savers in the "Personalisation" list. There are 2 which have different names to savers in the Personalisation list but which seem to be identical.

Why is there this anomaly between the two lists?

Searching (Start/Search/For Files or Folders...) for .scr shows every combination of those three
letters, including .scr and .scr.mui files. What is the significance of the latter?