iPhoto 'lost' photos and is saving strange images
iphoto has suddenly lost a lot of my photos for no apparent reason. They were all there yesterday but today when I went in to iPhoto lots of the albums said they contained no photos. I haven't done anything differently, have not deleted anything or made any changes. I basically edited a few photos from one album, saved them to a new folder and that was it. Can anyone tell me what I need to do to restore the pictures? Please note that I am definitely not technical, so any answers in basic "layman" terms would be appreciated!
The second problem I have is that for AGES, iPhoto randomly saves a load of weird images into the library and folders. It's usually things like logos, icons, weird computer style images etc. There are literally thousands of them clogging up my iPhoto folders and I really do not have the time to select each one and delete . Does anyone know how or why these things show up in my iPhoto library/folders? And is there any way of stopping it happening?
Thanks
iMac, Mac OS X (10.7.5), null