Hello, A few days ago our MacBook was left on (but without any programs running) for about an hour or two. When my wife came back, she heard from it a voice speaking in Chinese and there was some activity going on, something about "download in progress". Afterwards, the desktop items completely disappeared and the entire contents of the iPhoto files were invisibly copied onto the desktop. However, these duplicates cannot be accessed; when we click on them, the message says that they are being in use by the system. I know that this is not only weird but also very imprecise; I can't describe it any better, though, since I have only heard about it from my wife. Now the laptop is very slow, the desktop icons reappear after we click on the space where they should be but then they disappear again after the shutdown. Strangely enough, the memory does not seem to be affected by the supposed duplication of picture files from iPhoto. It all looks like a virus or a malware but I have run several different scans and they showed nothing. Any advice will be greatly appreciated.