Pc graphics problem cant slect high color

Question

My windows me that i have just built is running on 16 colors which is very low color so i have changed my graphics card to a turbo 3d enhancer but when i go to (right click - properties - settings - color ) when i select high color 16 bit it asks me to restart which it should not so then i restart my pc and it dose not work and after the settings have supposed to be changed they are not does any one know the answer to this.