I don't know what changed. I was able to install applications the other week by dragging and dropping applications in to the Applications folder, but starting last week I wasn't able to. I checked the folder permissions and the Admin has read and write privileges. What also happens is, for example, I open the Skype dmg, and try to drag the application into the folder--it doesn't work. But after that, I can't eject the drive, or even shut down my computer without it warning me that there is a process happening. The only way out is to force Finder to relaunch itself. Can anyone please help me? This is very annoying!