Crazy Error

Hey, I need you guyses help on an issue I'm having at work on some computers running Windows XP Pro. There's a website we use for all of our phone sales. aim.uscc.com. For some reason, when ever we click on the West/East we get this.

Instance Map

Obvioulsly, we should not. It should bring up the login page.

Now, if I click on tools and then Java Script Console, I get this error message.

Warning: The stylesheet http://aim.uscc.com/main/default.css was loaded as CSS even though its MIME type, "application/x-pointplus", is not "text/css".

Does anyone know how I can resolve this issue? At first I was thinking it's the site, but it doesn't do it on the other computers at work. I've also tried Mozilla Firefox and Internet Explorer so I don't think it's a browser issue. Any and all help will be much appriciated.

Thank you.

Here are photos of my problem.

I start here

I get this when I click West/East

This is what happens when I click on the JavaScript Console under tools.