Hey,
have you downloaded firefox yet?? Go to http://www.mozilla.com/firefox/ and click download. If you want to mak e it your default browser you may be prompoted to do so once installed. If you want it instead of Internet Explorer in the start menu then: Right Click the 'start' logo on the taskbar, go to properties click 'Customise' and where it says show on start menu click where internet explorer is and change it to Mozilla Firefox and click 'ok'
If you've already installed Firefox and you want to import your Favourites from IE to Firefox: open Firefox, click on Bookmarks, Manage Bookmarks, File, Import. (If you haven't installed Firefox yet, it will ask you if you want to do this as part of the installation anyway.)