|If you are in set up for Windows you can tell it that you will set up internet later and it will complete the set up except for registering and updating. You can also connect it via hard wire to the router (Cat5, etc.) and set that up easier and do the Wifi later.|
If you are just setting up the Wifi on a working machine then have you tried turning off BOTH the router and the computer, wait a half a minute and restart them both. Have you tried the WPS set up button/procedure? Have you installed the drivers for the Wifi card? Have you tried to update the drivers? Drivers for a laptop or other machine that included Wifi would be though the manufacture's web site under support>downloads. Drivers for add on cards you purchased separately would be through the card manufacture's web site (I rarely use driver disks so I get the newest version.
You have to be a little bit crazy to keep you from going insane.