And Sony support is pretty much useless. I keep getting the "re-install" line, which doesn't work. Today they told me to go into Windows Safe Mode and install it.
Yeah, I got that one, too. Fortunately for me, there was a thread somewhere around here about the problems people were having with the software on Vista, so I followed their advice and it's worked okay ever since. What killed mine was a file that I think might've been corrupt, because I haven't tried to load that file since, and *small voice* everything's been okay.
Now watch, it'll mess up on my just because I said something...
Here's the link to the thread that helped me out. Although my problem wasn't with purchased books, this might be of help to you: