madden online play help

i am a long time buyer of EA's madden guys. been following it for back when super nintendo was the rage. i have a ps2 but came across madden 08 pc at a yard sale. scooped it up for ten bucks but when i try to play online it wont register my cd key cuz its been registered under a diff account. anyone know how to help out with this as im sure u all true madden-ers know that playing the cpu even on all-madden is like taking candy from a baby. thanks all