I just bought a SoundBlaster X-FI Xtreme Media. Now all of my speakers work except the center and bass when I test it on volume configuration, but when I listen to music, my bass and center work, but my back 2 speakers don't work. Oh, and I have Vista. Any ideas to what is wrong? I enabled X-Fi CMSS-3D, but I don't know the difference between Stereo Xpand and Stereo Surround. So I pretty much have tried everything I am aware of, but nothing worked.