Thanks Horms for your attention,yesterday I asked inone list how to select the 2.6 kernel on the installation for the stable version, and last night I used linux26 as the boot's option.
I selected the Realtek's network card, and everything worked fine, I have an emachines model t1742 at home.
So today I think that the problem was with the drivers on the 2.4 kernel. Appreciate all your help. Best regards Enediel