Try the following.Start/all programs/creative/sound-blaster icon, then click on surround mixer, speaker set-up should now be showing. If you have 5.1 then set from here and test, Then click on the "Mixer" button, lower left of the same window, menu will expand to show inputs, make sure none are muted from there, then click your way out.
Now right click on your volume Icon it's in the windows sys. tray, choose properties, un-tick any "Mutes" that apply. Now look to the top left of same window, click on properties, another window will open, place a tick in all boxes that you wish to work, close the properties window, main volume display will still be in view. Re-check all the boxes at the bottom of each function to make sure none are on "Mute"
Thats it, should do the trick for you. j.