I frequently use my computer to watch digital TV, and also to watch my Vcr tapes. Until lately everything has been working just fine. Now, for some reason I can still watch a tape, but I have no sound from it. I have tried many other tapes with the same result. My Tv Tuner Card is working just fine, and so is sound for my games and applications. I have a Genius Sound Card and an Akai Sound System. My Pc is an Athlon Xp3000+, with 512Mb of DDR 400 Memory. Do you have any suggestions?