No volume no sound

Hello,

I have no sound or volume control as well as display of volume or turn volume off on the screen since installing windows xp professional service pack 2 so that I could install Norton 360 also says no audio device when I tried to troubleshoot it myself. I am not that computer savy. I have an IBM Thinkpad model 2682 running Windows XP Professionl 2002 version. Would love some help and thanks to anyone who does!