system prefs 7.0

OS 10.6.8 For some unknown reason, the desktop/screensaver icon will not function. The icon is still there.
Sometime last year the icon disappeared but my son who also has S/L emailed me the Desktop.prefPan.PrefPane as an attachment. it appeared as a common wall light s/w. When I opened it, a window appeared asking if I wanted it installed and after agreeing, it installed immediately. Problem solved. However, this time after sending me the same attachment and I clicked it, a window said it was already installed or corrupt. Since it is still there, obviously it must be corrupt. Question: does anyone know how to remove the existing icon. Then I can install the new one which is sitting on my desktop.
delta214

 

--- Post Merged, Feb 27, 2017 ---

I don't know how to fix the icon but it would eliminate the problem if someone can explain how to remove it.
One suggestion was to click control & desktop/screensaver together and click customize under view but that doesn't work for me.
Ideas anyone?
delta214