I've tried it twice on my windows xp machine and today I reinstalled version 2.5.00.09170. It ran great on the windows machine until I tried to load my lrf library. With over 7000 lrfs, it just wouldn't work. I could get the books to load and then nothing. I read that it started working for someone else here, so I reinstalled it and left it running for 4 hours. I still could only click on a book and lock it up. I deleted the kinoma and Sony Corp files and reopened the software and it works great without any lrfs. So for the 2nd time I uninstalled the 3.0 software and have the old stuff. It works and the new software doesn't offer me any reason to update. Maybe by the time I convert all my books to epub, I'll try again. With about 50 epubs, the 3.0 software worked great, but that doesn't help me right now. I also have it running on os x tiger and leopard and both of them lock up when I add all the lrfs. As for now, I just leave the library empty and add a single book from finder when I want to view it. At least I have a great lrf viewer on mac now.