if I recall, I only checked the uppermost box in the advanced section. I get the tiles (icons?), but no thumbnails. When I try to open in either windows pic viewer, PhotoImpressions 5, Mr Photo 3, I get a message saying no preview generated. Windows tells me that the "file is invalid or not supported". There is an addition in my pictures folder, though. It is a new tile created the same time CCleaner was run. It is a "Thumb Data Base File", with a DB extension. The tile has a picture of 2 meshed gears the upper one is green, the lower one is a yellow-orange. does this help, or mean anything?