I've been experiencing audio and

Question

I've been experiencing audio and video problems for the last few weeks and have tried just about everything to resolve this matter. I'm able to play all music in wmp or watch downloaded movies but I'm unable to hear Windows sounds or other internet sounds. I'm unable to watch Youtube videos because they play slow. It takes about 5 minutes to watch a 1 minute clip. When I attempt to listen to other music or hear sounds, I only hear a scratchy noise from the speakers.