Unless the user provides access to a GPS module one will not have a accurate location as no mapping exists between a DNS assigned IP address with a provider to a client with a ISP due to client privacy regulations (fortunately)
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2