troubles w/ centrino..

Hello,I boughtmy new laptop w/the centrino chip set. thinking it would be better for wireless connnections. it doesnt work, right now i have a 200 foot cable hooked to it and drag this around, if i diconnect it says connection id excellent/very good/good/low, varies but nothing loads. (internet) plug the 5e in then loads, but still varies in connection still. also when i have a fully charged battery and try o use this no connection, have to use the plug. Any ideaswhat is wrong, does the centrino need to be programed? i am using netgear wg814i believe router, sprint modem, xp home.. thanks ron

 

lol 200ft?