Couldn`t get this to work originally, but thought I`d come back to it and have another go with a later version. Two adjacent PC`s. One XPSP2, external ADSL USB modem (where sniffer is installed), the second Win 98. Both "networked" using a cross-over cable. Sniffer can`t auto-detect the network adaptor. Advanced mode shows "Realtek 8139-series PCI NIC (Microsoft`s Packet Scheduler)" in the network adaptor field, and no other, but won`t auto detect, giving "ERROR: Failed to find a suitable network driver. Please ensure you haver a valid internet connection and try again, or try to set your adaptor manually from Advanced mode", which is more-or-less sending me round in circles! Any answers, or am I missing something, somewhere?