ATA Channel 0: Device Cannot Start?

I'm having some trouble with my computer. About 2 weeks ago, my computer wouldn't produce any sound from the speakers. I checked and everything is unmuted but still no sound. When I go on Skype and try to receive or make a call, it says I have a problem with my playback device. Then, if I try to play a game on a disk, it won't work. I went to device manager and it shows a yellow symbol next to ATA Channel 0 and when I click on it, it says code 10 device cannot start. I do not know what's wrong!! I am using Windows 7 and my laptop is a Toshiba model number: PSK2CU-01Q01S if that helps any.