I'm following a tutorial on how to create a worpress theme

http://geeksaresexy.blogspot.com/200...lly-under.html

Iím stuck on the step 4- Open your browser and go to this address: http://localhost/. From the menu on the left column, choose your preferred language.

I have installed XAMPP and I am running apache and MySQL, I have been stumped on this bit for ages. Nothing shows up when I open http://localhost/. what am I doing wrong?