Opengl and radeon 9000pro

i just installed radeon 9000 pro and installed the latest drivers from the website. my only problem is that i have to turn off the opengl extensions option on certain video games to play them (jk outcast) and some games dont give me the option to turn off opengl extensions (total war)- if the game is played without turning the option off the game has some sort of 3d rendering problem i believe. any ideas out there?

i also should mention that i have win xp