My sound card is an onboard Intel 82801FB ICH6 High definition audio controller. And after I reinstalled XP on my computer, I found the drivers on the MSI website, and I installed them and my sound works, but only for one program, for instance, if i restart my PC and run a game, say BF2, the sound will work and work great, but when i quit, the sound wont work anywhere else! but error sounds work!!

how can i fix this very annoying problem?