Connecting to dlink-524 on vista

i recently brought a dlink-524. i installed it as the manuel told me to do. but then when i tried to connect to the internet and to actually connect to the network it says ''the settings saved on this computer for the network do not match the requirements for the network'' i dont know how to change the settings and the only thing i seem to be able to bring up threw d'link is propertys and it asks me for a network security key which i dont have. or if i do i dont know where it is. can someone please help me. PLEASE