I have been having a notification telling me I am low on disk space.(I use windows 7). I clicked on it to clear space on windows C and it came up with a box to clear temporary internet files, thumbnails, recycling bin, system errors etc.. At first I unchecked the bin and thumbnails and it ran with the reply that not enough space had been cleared so I did it again but forgot to uncheck thumbnails and now there are none on any of my photos. I need them back to make it easier to sort my photos but after trying all the usual stuff, still nothing. I have done all the usual stuff like going into view and tools and advances settings etc.. And checking and unchecking the appropriate boxes, but nothing. Any help is very much appriciated.