i have a logitech 5.1 surround sound setup and an audigy 2 sound card. when i first got it hooked up, all the speakers were working. one day i turn on my pc and only the front two speakers are working. i try to configure them in the sound options and i notice i only have stereo and mono available to choose from. so i reinstall the drivers...and now i have the 5.1 surround to choose, which i did, and tested them in the configuration window and i hear sound coming from them. yet i cannot hear movies/music from them. same with the center speaker. how can i get them back working? thanks in advance