Have you made sure that you're doing a complete uninstall? As Bookworm_Girl said, uninstalling leaves a lot pesky folders behind. I had the same problem with it not opening, tried just dragging the app to the trash, re-downloaded and had the same problem. After deleting all of those other folders in addition to the application, and downloading the latest version of the software, it worked for me, so you might give that a try if you haven't.
Otherwise, unless you plan on using it to download books from the public library (the only thing you NEED the Sony software for, otherwise you can drag-and-drop stuff) I wouldn't necessarily bother. Most of the books in the Sony store are also available for purchase elsewhere.
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