On purchasing my Macbook Pro I downloaded Skype to the desktop. Once I correctly installed Skype into the applications folder I went to delete the disk image from the desktop. If I click eject it does, or if I drag it to trash and empty it does also. On restarting my computer the disk img always appears again on the desktop? I have since upgraded my OS to 10.8.2 in the hope this might fix the bug and verified disk permissions nothing seems to make the delete permanent. I have even tried deleting skype all together from my computer and then reinstalling but this damn thing keeps re appearing on startup. I would appreciate any advice, thanks in advance