Hi, @Claudia Sánchez. I can't help you with the configuration of your laptop, but I imagine if you have it configured to show English (as you said you did), then it's going to default to English every time. You might want to change this configuration.
But to translate this site into Spanish, simply click on the Google Translate button at the very bottom of every page on this site and then select "Spanish", and Google will translate that page of the site for you. See screen shots below for the location of the Google Translate button on this site. Hope this helps!
Location of button at the very bottom of the site: