Problems With Iphoto


I have an older iMac (2000), I have been using my iPhoto to download my photos for some time now. Recently however, the program says it's importing my photos, but no photos end up on iPhoto. Our camera is a Canon Elph SD300, although it does not seem to be the problem. Also when I go onto the Internet, I get the message, Problem saving Bookmarks, and they are reset for me. And frequently Safari quits on me for no apparent reason. I'm not sure what has happened and how to fix it!!!