Hello Sir / Mam.
My friend has a Toshiba laptop with vista window. Every night at 10 pm, she got disconnected from her dsl wireless networking system at home, while other computers in the house are still connected. And she is not able to sign in. How could I fix the problem ?
Thank you very much. Good bye.

Are the other computers connected via wireless as well? Some routers have the ability to allow or disallow connections at certain times of the day. Was this accidentally turned on?