Oook.. This is a mess. Now, are you really fscking sure that you have only one router? Go to your 3com, grab a hold of every wire going into the box and identify the device at the other end. Then, unplug this 3com thing and see if all the your wireless and wired computers get disconnected. It looks like the WAN side of the router is 10.0.0.x and the LAN side is 192.168.10.x. This is OK. But then the wired computer shouldn't be receiving the 10.0.0.x address unless you plugged it in the wrong device.