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Please ensure that you are using the correct catalog. Take a look at this article Recover catalog and images after resetting preferences in Adobe Photoshop Lightroom
I am a none techie and am very lost. I have not made any changes to my preferences. Why is everything gone!
You have most likely (accidentally) opened the wrong catalog.
In Lightroom, use the menu command File->Open Recent and select each item shown there until you find the catalog showing your photos.
It worked for whatever reason!!!!! Thank you, thank you!