install.php won’t open in browser

I have reached the point in the installation process where I am supposed to open install.php in the browser. When I attempt to do this, it hangs up and will not open. I tried this on three different computers at home and had my husband try it on his computer at work.

The techs at my web hosting service say they can open it just fine and it must be my Internet connection speed. However, we have broadband and recently upgraded to an 11G router. Most pages open just fine, including pages on the site where I am attempting to install the blog.