You do not need the old computer to setup the router. However I would strongly advise you follow the initialization instructions that came with the router. You may need to activate the wireless system in the router. To do this you will need to have a computer plugged into a port on the router, log into it,....ETC.... Also, routers come setup with wireless passwords. You will need to go though the documentation to find out what the password is.
Most routers these days have a disc that comes with it that has software to assist you.
Past that, good luck. You know you are posting this on a "FLUTE" board? Right?
Phineas
computer & internet
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