How to connect my desktop to my wireless Comcast modem?

My laptop and my iPhone will connect to my wireless internet, but my desktop will not. It connects with no internet access and I've tried all the repairing I can think of. I got my laptop to connect wireless by using an ethernet cable and plugging it in. I tried that with my desktop and it isn't working either. Help! I've tried everything I can think of, but I know little about computers and cables, internet, etc. I tried getting Comcast to help me but they wanted to charge me for their "free" service.

Added (1). ROUTER, not modem. My bad. An Arris Router.

If you want to connect your desktop wireless with the router you will need a wireless usb adapter like this…

http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=3970955&CatId=2688

however if you connect the ethernet cable to your desktop it should work unless the settings are screwed up… E-mail me if that is the case.

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