So I’m trying to install Mac OS X Lion 10.7 Dev. Preview 4, but this annoying message shows up on the Installation App. ( As some of you may know, 10.7 instalattion will not run installer, It will run an application named "Install Mac OS X" ). The Message it tells me is “Please Use System Preferences to fully disable FileVault on each encrypted Volume before Installing Lion Developer Preview 4. File Vault can be re-enabled after instalattion.” The thing is, File Vault is already turned off. I Tried closing the application and opening again. I am afraid that this means I wont be able to run the full version Of Lion. I really need help. Please Help Me. There are two screenshots. One screenshot is the message that it shows me, the second screenshot is filevault being already off. Please Help.