Roamex said:Also there are other things that can be considerd but pricey. there is a technology that allows all your powerlines in the house to be used as ethernet cords.
http://en.wikipedia.org/wiki/Ethernet_Powerlink
Also there are wireless extenders that will allow your wireless connection to reach futher in the house. place it somewhere near the middle of your wireless router and computer and it will improve the connection.