Aero Theme problem

i've just reacently got vista ultimate and regitered etc etc. and i can't run aero theme!!!! i ran the advisor and other internet compatibility things for vista and it says that i can run it perfectly. when i look into the window colour and appearance options. i can't find aero theme. what could be the problem?

 

try lookinjg for different drivers

 

you mean for my graphics card?... i already have and i have the most up to date one.