Ok, I was playing a game and the sound cut. The speakers were still on, so I closed the game and checked the sound settings, and lo and behold, the mute had been turned on. All fine untill the next day when the same thing happend. This time when I went to turn the mute off, the tick would stay in the box and only the sound that was supposed to be from the left speaker would work. I have checked for viruses, spyware and adware and this hasn't fixed the problem.
Intel P4 3.2GHz Prescott @ 3.8GHz
Asus P5GD2 Premium Motherboard
Saphire x800XT With VGA Silencer @ 520MHz and 1.15GHz
Corsair 1GB XMS2-4300
Antec PlusView 1000AMG Case
Maxtor 160GB SATA Hard Drive