1} i have intel(R)82954G expres chipset family video card. & audio device as realtek high definition audio. is this not good compared to nvidia video card? will any1 give screenshot of those video card name and direct x compatible sound card name installed on their own pc ?

those requirements(nvidia video card & direct x compatible sound card ) are for high definition games.
2} i am able to play with sound Bionicle Heroe- a direct x 9 required games so i gues i have direct x 9 or above compatible ound card installed in my compaq SG 3230 IL. Is MY GUESS RIGHT ?

the differance between onboard sound/video chips and real cards is
that a card renders sound/graphic's by itself
while the chip renders thru motherboard and cpu
[putting a heavy load on the cpu]

brand-names are not importend