I use vista, and the worst thing it did to me was give me an error saying that... in My words, the files don't "sync" and so there might be errors. But it never really screwed up for me. You just have to click "ok" or whatever. It's been a while since it first gave me that problem, but that's the gist of it. Anyways, I would just recommend try re-downloading the installer, perhaps they updated it with an uncorrupted version by now. Otherwise, I'm not sure.