Pro Tools 7.4 LE issues

I have recently changed over my computers to an iMac from a 2008 Mac Pro. I have Pro Tools 7.4 LE and it will not recognize any of my hard drives as valid audio drives. I have tried to uninstall the program with the uninstaller but that fails and does not uninstall Pro Tools. After putting in my password to allow the uninstall it returns to the option screen to choose what type of uninstall to execute. I have manually uninstalled all the pieces of Pro Tools and then re-installed the program, but that still has no avail to the problem.



Any guidance for me on this issue? I understand that there may be an upgrade in order, but I wanted to know if there are any other routes available to me that I have not thought of yet.