My Dell XPS laptop, which runs Vista, isn't able to connect to my home's unsecured wireless network. It connects just fine to the secured network at my mom's house, and the wireless switch is on and I am able to view the available networks. My other laptop, the one which I am using right now, is perfectly capable of connecting to this network. How do I make my Dell able to connect? It's running Webroot Antivirus as well as Windows Defender.