sync problem

Adobe Photoshop Ligtroom 5.5 Windows: How do I remove the download. I have deleted completely the image that the sync problem affects. So there is no help if i select all the images and import them again in Lightroo, because there is no more images to delete. The announcement "Oh no! A black hole. No photos matching these filters were found."
I can't do anything to stop the download. I reinstalled all Adobe programs and deleted Adobe files, doesn't help. What can I do?