Rehabman, I do appreciate your responses, and am sorry for frustrating you. I am doing my best to learn to be self-sufficient, so I appreciate your patience. Here's what I did precisely:
- Manually moved Trackpad.prefPane from the /S/L/PP folder where I had manually placed it yesterday onto the desktop.
- Launched Terminal.
- Cut and pasted this command from your post into Terminal: sudo rm -Rf /System/Library/PreferencePanes.
- Pressed return.
- I was prompted for my password, which I entered.
- Upon password acceptance, and the new bash cursor, I cut and pasted the following command from your post into Terminal: sudo cp -R ~/Desktop/Trackpad.prefPane /System/Library/PreferencePanes.
- Pressed return.
- When the best bash cursor came up, I closed terminal and restarted the computer.
- Once restarted, none of the Preference Panes would load, per the photo attached earlier and am reattaching here.
The remaining photos show the contents of S/L/PP as they currently stand. If there is anything I can do to avoid a clean install, I'd appreciate knowing it. Thanks again for your patience.