I have a problem with my sound when I'm playing New Vegas. I can hear the background music just fine, but I can't hear any weapon sounds, any menu sounds, any pipboy sounds, I can't hear people's voices when they're supposed to be speaking, and their lips don't move when they should be speaking. The last thing I did before the sounds stopped working was install a new Pip-Boy texture, if that has anything to do with it. Please help.