Network Add Computer

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Hi,


In Network add computer I get "the selected computer is already part of another network" when I try to add from a particular PC. They all have bitdef 2009 internet security Bld 12.0.12.0. The Top of the tree says 192.168.2.1 on all the computers. I added all computers successfully on the other PC's, even the one giving me the error. Is anyone familiar with this?


Thanks.