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#11
Seeing other PCs are also related to services so don't mind them at the moment. From one of the wired PCs go into your router's management interface (using Internet Explorer) and set a password (pass-phrase) for the wireless network, also check the SSID of the wireless network. Now, check all the wireless PCs to see if they are indeed connected to that one. Change the ones that are not.
If you change the pass-phrase you may need to forget the wireless connection and re-connect to it. This is normal.