Windows installer script uses incorrect archive extensions, target directory is not in PATH

[larrypsmith]

• The Windows install script fails because it expects the binary archive to be a .tar.gz, but it's actually a .zip. Fixing this is just a matter of updating the installer script to use the correct extension.
• After installation, windsor version fails because the target location for the extracted binary, C:/Program Files/Windsor, is not in the system PATH. It would be nice if there were instructions to update the PATH or a script that does it for you.

[rmvangun]

Resolved by #1960