Not sure what I have done but Multiple pictures are being duplicated. The computer slows to a crawl. I have Deleted files only to have them reappear and light room can no longer find my original pictures Though they are still present on the hard drive. Have hours and Desitin developing these pictures I'm not sure how to proceed.
Did you create virtual copies by hitting Ctrl+T by mistake?
Do you see a '!' on pictures in library and/or a '?' on folders in the folder panel?
Please post a screen-shot where we can see the issue.