Possible large problem uninstalling Photoshop CS3

i had Photoshop CS3 on my macbook and it kept showing errors trying to do various things, so i decided to get rid of it and reinstall it. I didn't realize that in order to remove it from my computer, i need to use the uninstaller, and i didn't realize that in order to do that i need to deactivate CS3 and i didn't realize that in order to do that i need to have not deleted the CS3 file and emptied the trash bin. Unfortunately, i realized all of this too late and am now in quite a pickle. Is there any possible way for me to uninstall CS3 completely, or install it again somehow? Any help would be greatly appreciated