Up until now, I've been using the demo versions of Adobe Illustrator on my computer. I've installed it on both Windows and OSX, to pretty much get a 60 day trial instead of 30. Now I finally have Adobe CS3 Design Premium, but when I go to install the programs, it won't let me install Illustrator because it says it's already installed. I did keep them on incase I planned to upgrade, but it won't even let me. It doesn't give me the option to reinstall either. I've deleted them both from Windows and OSX, but it still says its installed. How can I purge it completely from my system?