McAfee INTERNET SECURITY SUITE 2008 User Manual page 209

Chapter 40 McAfee Internet Security 207
Stop trusting computers on the network
If you trusted other computers on the network by mistake, you
can stop trusting them.
Click Stop trusting computers on this network under I
want to.
Note: The Stop trusting computers on this network link is not
available if you have administrative permissions and there are
other managed computers on the network.