semi forgot about this post, but just going to assume you are running a realtek audio type motherboard, it would have a icon something like the speaker on your task bar, and the environment effects would be something like this image(random google find).
Also, if you dont know the maker of the board, at least post who made the computer and what model number they put on the front of it. ie: HP Pavillion XXXXX
Athlon II X2 245, Deepcool Gamerstorm hsf(w/ Deepcool SF120 & Cougar CF-V12HP fans), 4gb ddr2-800, GTX 460 2gb, Auzentech X-Mystique, Gigabyte M68M S2P, Win 7 Ult x64 -desktop
HP Elitebook 8530p - Intel P8700, 3gb ddr2, 80gb intel x25-m, ati hd3650