wifi network recognition

Good morning,

First time in a forum. I have a Dell D630 Lattitude laptop that connects to most Wifi Networks, but NOT my home network.

In fact, It doesn't even show the network when I pull up area networks. It doesn't show any networks at all. However, when I take

it to a Starbucks or McDonalds, I can not only find a network, but I can get on the Internet just fine !

Do I have something blocking the network from being seen? Is my virus program Microsoft Essentials blocking the network for some reason ?

I haven't spent a lot of time looking for answers because I have another computer, but I'd like to fix this problem if I can.

Thanks,