I guess the first thing you now need to do is to get the latest drivers for your printer because as you say you uninstalled it from your machine and now reinstalled it again. I don't know why you thought printer should have been uninstall;led but anyway, please reinstall the driver and then see if it is recognized by your operating system and try scanning something as a test from outside the PSE13 before going back to PSE13 and trying to scan your real image.
Please post back so that Barbara or R_Kelly can help you as I don't use Apple Mac.