It works now! Yes, I was connected to my router but somehow not in the right way. I always saw the message 'salazar (my router ssid) connection established'. However, I was just never able to browse the internet. As you said I deleted my wireless connection to salazar and let the computer scan for wireless. It picked up salazar and I just entered my password and now it works.
I don't know what really the problem was. However, I really thank you all for your help and support.
my best wishes to you.