I am in my town again and, of course, was impossible that everything went ok. The first thing I saw when I open my laptop was that I hadn't got internet conexion. Why?? I didn't understand anything, the table computer worked and had internet, why my laptop didn't?? Finally I discovered that the router was broken.
I spent two days traying to put another router buy it didn't work too; after this, I decided to open my old router and adjust some things. I really don't know what I did but, the router began to work!!!!
I am proud of myself!!!