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If you can't see the IP address of the second computer, you must be able to see its name on the network map (or the IP on the network map). Open the command prompt, try the ping command using the PCs name, and see if you're able to get the IP.
A better solution would be to change the WPA passphrase, and then check if these devices are still online. If they are, they may actually turn out to be something pretty harmless, like a set top box, a printer, or a remote network share.
OK - where do I find the command prompt?
Click on start
type CMD and hit enter if XP
else..( if vista)
click start and type CMD and runt he cmd.exe file