[Obsidian Dragon]

Did you have your previous version of Protools installed in a different location (directory) than the default? Did you move the previous Protools directory to another location as part of organizing you hard drive? Are you installing PT9 into the same directory as your previous Protools version?

I'm assuming you are using the updater and not the full installer (both are available for download in the crossgrade. If it still does not work, try downloading the full installer and remove you current version of Protools from your system before installing. As always, make a good backup first.