The sample files you mention are Screen Savers. The files have an
extension of SCR. You can go to Start>Search>Files and folders
and type *.scr and click Search. It will list all the ScreenSavers that
you have. There you can rightclick and Delete, but once deleted you'll
encounter a problem to reinstall them if you change your mind at a
later date. You have been warned..............Happy putering and New Year!
Look here: Rightclick open area of screen and click Properties.
It should open under the Themes tab. Under Themes, scroll down
till you can highlight the ones you don't want and click the Delete button.