We also confirmed this installation issue was addressed in the latest version of the installer. (8.3.x and 8.4.x) However, we would like to warn endusers who might be affected by this issue trying to install 8.2.x versions on Windows8, and to direct them to install the latest version. You provided the following URL, but better yet is there a download site for the newer version we can direct endusers to?
That's not a PostgreSQL community web site, so it wouldn't be appropriate to send people there, I think. However, you could direct them to the PostgreSQL download page: