Download inSSIDer and Discover the Wi-Fi Networks Around You | MetaGeek | Techy Stuff | Scoop.it
From www.metageek.net - April 13, 2012 11:39 AM

inSSIDer is the best free Wi-Fi network scanner for Windows 7, Vista and XP. Because NetStumbler doesn’t work well with Vista and 64-bit XP, we built an open-source Wi-Fi network scanner designed to work on all current generations of the Windows operating system.