XP bugs after formating

I recently formatted my computer and ended up with a few bugs. I have no sound when I try to plan an mp3 file with winamp i get an error msg saying: "Bad DirectSound driver. Please install proper drivers or select another device in configuration. Error Code: 88780078". My screen starts to lag when I scroll down on IE (it makes a flip book effect). I also lag when I hover a window around the screen. I never had these prolems before formating. Can someone help?