I'm glad that it is working. If you want to get the Sony software working, perhaps post again asking for help with the Sony Reader Software......
The book you got on your reader, was it a free one from the link I sent you? Did you buy one from Kobo?
If you are looking for a particular book
http://www.inkmesh.com/ is a great ebook search engine. Note when you put in your search (author, title or genre) there are two buttons. One for store books, and another for free books. Your reader can read ePub, lrf, or PDF books. Most ebook stores will carry one or more of those formats. Amazon does not, but most of the others do. B&N is also not a good place to buy, they have a goofy DRM scheme that it is just better to stay away from.
Another good ebook store
http://www.booksonboard.com/index.html?ebooks=ebooks . When you get a book just choose the Adobe ePub format.....