Page not found error shown while installing wordpress on IIS server

If you’ve uploaded all the WordPress files, then it appears your web site isn’t setup to process .php files. Ask your web host to enable PHP for your site.

It would appear you’ve uploaded the files, as I see http://np-environmental.com/newsite/license.txt and /readme.html, and looking deeper /newsite/wp-admin/css/about.css

Assuming the Windows server has PHP installed and configured, and IIS is setup to process PHP requests in general, your site will need to have a handler mapping for PHP added. Otherwise you’ll get HTTP Error 404 - File or directory not found if you try opening any .php files.

If this is your own Windows server, there are detailed instructions on what you need to do for IIS 7+ at http://php.net/manual/en/install.windows.iis7.php, or older IIS 5.1/6 at http://php.net/manual/en/install.windows.iis6.php.