I think if you got a wireless adapter- usb or internal card --the usb type would probably be easiest for you , no opening the case to install a card , just plug in the usb part and set it up.

most have a cd included with them in the package that you can use to install any needed drivers and programs.

Just checked a Dlink USB adapter on Amazon - looks like they have the programs built in with a wizard to help w/ set up.

when you look at usb adapter & routers - best idea is to use the same brand name, just simpler that way.