I recently bought and downloaded a program named "MacKeeper" to supposedly clean and optimize my IMac, as well as install an anti virus program. Well, as soon as I did it, I was unable to access or open Adobe Acrobat. The program is still there, but all I get is a blank screen. I've since deleted Mackeeper, but cannot figure out how to get Adobe back up and running, and I need it to read and send PDF files. Can anyone help?