Wasted an evening trying to install on Windows XP. First, it interrupted, since I didn't uninstall 2003 version, skimpy documentation didn't highlight that. Then, after an hour it got almost to the end, it complained about excessive disk activity. There was no application running, but I had left screen saver on. Ok, no screen saver, no application, still, after another hour, error! Had to reinstall 2003 version from CD, including another hours of updates for it.