Wireless modem/router question At least one machine will need to connect to the router using an Ethernet cable in order to set it up, once setup all machines can run off wireless if you want. The product you link to is an adaptor that changes a USB port to and Ethernet port which would then connect to the router via cable, this is not needed as a wireless adaptor will come with the router for your old PC (providing it has USB capabilities) and you can use the new laptop with a temporary cable to setup the router and then run both on wireless after the router setup.
Hope this helps.
Dave.
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