CSS not attaching locally

I've got a new laptop from work, I took it home over the weekend to start a new website for a client. I built the index.html and styles.css in Brackets. Hit the preview (chrome) button - looks great. I opened the working folder and tested in the 'Fox - fine. Tested in IE - no styles... Checked my code, looks fine (plus it works in other browsers) checked IE dev tools, the DOM explorer shows the for the style sheet, but no styles are present in the dev tools Styles explorer.

I asked the techs at work if it might be something to do with the Laptop local profile, but they think not. I have full admin rights and Firewall is off.

Laptop is 64bit Windows 7.

I.E. version 11

We're baffled!

Any ideas?

Thank you, Jess