Driftnet is not available for Windows but there are a few alternatives that runs on Windows with similar functionality. The best Windows alternative is Wireshark, which is both free and Open Source. If that doesn't suit you, our users have ranked seven alternatives to Driftnet and three of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Driftnet are tcpdump (Free, Open Source) and York (Free).
Wireshark is the world's foremost network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. It is the de facto (and often de jure) standard across many industries and educational institutions.
tcpdump is a common packet analyzer that runs under the command line. It allows the user to intercept and display TCP/IP and other packets being transmitted or received over a network to which the computer is attached.