I'm here because I have been having an issue (for a while now) where I sometimes lose sound when transitioning from full screen games to my desktop or vice versa. Either I start the game and my sound is gone by the time I'm at the main menu, or I've been playing the game with sound fine and when I exit back to desktop, I no longer have sound. It can also happen if I alt-tab out of a full screen game or back into one. I've experienced this with modern games like Team Fortress 2 and Civilization 5, and ancient games like Starsiege: Tribes. In any case, when this happens my sound is simply gone and the only way to get it back is to restart my PC. It's almost always back when I restart my PC, but a couple times upon restart I've been met with a very high pitched tone coming from my speakers that required another restart to fix. I've also had this tone a couple times, instead of the loss of sound, after starting/closing a game.
Does it sound like (hehe) I need a new sound card? The one in here is I think what came with the machine like 4 years ago, a Creative SB X-Fi, pretty basic I think. I've never really felt like I needed a fancy sound card, but I guess this one may be conflicting with my OS as it was kind of a pain to get working after I installed 64bit Windows 7.
Any advice is appreciated!