SmartSniff
On Win2K/XP, SmartSniff is able to capture TCP/IP packets using raw sockets. This method has some limitations and problems, but it does not require the installation of a separate capture driver.
A better way to capture TCP/IP packets is to install the open-source WinPcap capture driver. This works on Windows 98/ME/NT/2000/XP/2003, and functions better than the "raw sockets" method.
Download SmartSniff