I have Acrobat 5 and installed Reader 7 some time back. For some reason Reader 7 will no longer open. I get a message that says the installation source is unavailable. I downloaded Reader 9 and tried to install it and got a message that said the install program was unable to remove Reader 7. When I tried to remove Reader 7 through the add/remove software option I received the same message, installation source not available. I really would like to update my Acrobat 5 but do not want to spend the money until I can get this issue fixed. Can anyone help me with this?