D-Link Ethernet Broadband Router

What I would do for the computers that can't get internet connection. Basically just connect to it wirelessly with a wireless adapter that I talked below,

1.I would go buy some "USB" wireless adapters you can get them for $15-25.00 USD
Linksys carriers ones that I use,heres a link to what it looks like.
http://www.linksys.com/servlet/Satellite?c=L_Product_C2&childpagename=US%2FLayout&cid=1115416827517&pagename=Linksys%2FCommon%2FVisitorWrapper&lid=2751739789B16

that is the one I use for my Desktop.

Once you get those setup and install the drivers with the disk that come with the wireless adapter you just connect to the router wirelessly.