I've been used D531 latitude with XP sp3. i have some problem with Audio device. at first, i've installed sigmatel driver onto my labtop and then restart. My labtop can use properly but after restarting again my labtop has some problem with audio device. I looked at device manager, there is yellow sign on sigmatel high definition audio CODEC. i don't know how to solve this problem. so that i have to install sigmatel driver everytime i use my labtop. please help me to solve this problem. all your helps are appreciated.

thanks a lot.