Is there something speacial that you use the software for? If you have a decent editing program, I find the software that came with my camera pretty useless, compaired to PS. I do use one of the programs to download my images, because it's so simple. I just plug my memory card in, hit enter twice and the PC does the rest. Even that could be done in PS or a number of other ways. Of course if the editing software you lost, is the only editing software you have, then I would contact Canon's support people.