pcapy
Pcapy is a Python extension module that interfaces with the libpcap packet capture library.
Windows install 32 bit
Pcapy requires python 2.5.
Python 32 bit: http://www.python.org/ftp/python/2.5.4/python-2.5.4.msi
winpcap: http://www.winpcap.org/install/bin/WinPcap_4_1_3.exe
Install python to C:\Python25\.