My brother has a Macbook pro, so I'm positive this is how you can fix this problem. If you did delete all the files, they will be in your 'Trash' application, which is on the far right of your toolbar. It should be the one with the trash bin icon. Click on that, and it should appear there. You can right click, and press 'restore' to get your files back. That way, you can uninstall it and reinstall it again.