Inspiron 1501 wireless problem

Hello everyone. I´m from Mexico and last December I ordered a Inspiron 1501. This have a 1390 mini card for wireless. For infraestructures networks I don´t have any problem, however, at my place last week installed an ad hoc network. Here is when my nightmare begins :robotsad:. I let the card tool to recognize the wireless connections and the ad hoc network is finded. I have a security code and configure the connection. It seems to be connected, but don´t send any package, so I can´t connect to web.

 

I have win xp home at spanish, my firewall is disabled and WEP security.

 

Can you help me with this issue? please!!.