This solution has nor worked for me. Win 7 refuses to install the WinPcap 4.5, saying it is incompatible. The installation aborts. When I then try to run the program, an error message appears saying that PACKET.DLL is missing from my computer. It does this no matter what compatibility choice I make. Do you have any other ideas of what else I might try? Do you know where I can download PACKET.DLL? Thanks much for any assistance.