Hi, I had recently purchased a brand new Airport Express with the intention of using it purely as a wireless printer hub for my bro's PC and my MBP. However I'm having difficulty in hooking up the printer to the Airport Express. After plugging in the USB cable and heading into the Airport utilities to locate the Airport unit, I am unable to establish a connection. Instead I received the message "An error occurred joining the selected wireless network" My question is how does one use the Airport Express just for wireless printing without any internet connections? Thanks!