I have a dell inspiron 1545. This morning i was connected to my home wireless network no problem as i do everyday. A technician came out and installed new cable and new internet today. He tried to set up the internet on my laptop but it will not connect to any net works not even my old network that i used problem free this morning. My other computer is connecting no problem to both the new network and the old network. I can see all the networks in the area but when i click connect the box just dissapears..... when he took my laptop to set it up it was connected to the old network connection and immediately after he disconnected me from the old one i could then no longer connect to any network.