Forum:I just bought fallout 3 game of the year edition from walmart and im trying to link it to my steam account but its not working any suggestions im using the game code it comes with but steam says invalid code

like i said i just got this game i got it from walmart because it was $20.00 with all the dlcs and on steam its on sale for $25.00 so i saved money but its not linking to steam and i looked on steam it says just type in the cd code for the game and it should be good to go any suggestions on what i should do?