I'm having the same problem. It can find the network drivers, but can't use them apparently. It used to work. I have no clue what changed, but it doesn't anymore. Windows 7, 64bit. WinPcap finds 3 drivers fine. Just UrlSnooper can't get any of them to work. Other snooping programs can use them appropriately, but don't do what I want (which UrlSnooper does), so I really wish a fix would be found. I absolute adore UrlSnooper.