Sorry, I should have been more clear about it. I just used the above commands as an example from the video. My actual IP addresses were:
arpspoof -t 192.168.1.1 192.168.1.4
arpspoof -t 192.168.1.4 192.168.1.1
The Win7 host (192.168.1.4) is connected to a NetGear router. It worked for a little while after I ran the arpspoof commands from Ubuntu 11.10 but then lost the network.
Thanks.