What Is Transferring is a easy-to-use packet sniffer for Windows 2000/XP. It is able to capture TCP/IP packets that pass through your network adapter, and view the captured data in Text mode (for HTML page, email, etc.) or in Hex/Ascii mode (for ZIP, JPEG, GIF, etc.). With this software, you can check:
1) If there is any unwanted connections
2) What have those connections sent or received.
Tools and Utilities
Product page: here