salam to all of my friends

friends one of my friend told me that window 7 is much batter then window sp sp2 so i got the cd and install it afterrr installing its looks beautiful but i have audio problemm on icon of volium trere is red crose on it .plz tell me i need to install auido of this window 7if yes then please give me link to download auido drever or any other action i have to takethanks in advance