I have just upgraded from Parallels 7 to Parallels 9 to run some OS X installs in virtual machines. I have two Lion and one Mountain Lion that I haven't run since Mountain Lion. I am trying to get them back up and running but I keep getting an error on the Parallels Tools. It always fails to either install or uninstall. When I try to uninstall, I just get an empty mini-sheet with a "Close" button and nothing else. When I try to install, it always fails on installing Shared Folder support. The post flight script finds nothing to load. I mounted the Parallels Tools installer and manually installed all of the sub-packages except for the Shared Folder installer. Otherwise, they all seem to work. I still get a message at the bottom of the screen that my Parallels Tools are out of date. I don't really need Shared Folders and had them turned off anyway, so this is no great loss. Just an annoyance.