PacketX is set of ActiveX classes that integrate winpcap packet capture functionality with Visual Basic or any other programming environment supporting Microsoft ActiveX technology.
In brief, PacketX uses winpcap libraries to capture (and optionally filter) network packets. In addition to standard capture mode you can collect network statistics and send raw packets. All captured packets or statistics are encapsulated inside wrapper class and returned to client as events.

You have to install the winpcap library before trying to use the PacketX. If you do not have the winpcap installed the PacketX installation will succeed but it fails when you first try to run it.