Hello, helpful people, First things: MacBook Pro Mac OS X 10.6.2 Two weeks ago, an .xls file I had worked on had been deleted the next morning when I looked for it. Last night, I noticed the same thing happened with a folder and files within it - to which I had recently saved files. I did not manually move these folders or files to trash, they were just there. They were both the last things I had worked on before I shut down for the night. After the incident two weeks ago, where I had lost an entire day's work, I got in the habit of looking into my trash before emptying it. That's how I discovered the newly deleted folder, plus about 100 music and photo files, all of which I did not move to trash myself. I did three additional things yesterday in addition to working on these files - I backed up my hard drive using Time Machine, I synced my iPhone, and I plugged in an external drive (which is where some of the photo and music files that were deleted were stored). Any ideas? I know it's virtually impossible to have a virus, but the file and folder deletes of the most recent docs worked on are just plain weird. Thanks!!!