With Half-Life, go into the Config file and change A3D and EAX to "0", than save it. It'll be located under Sierra/Halflife.
You will deffinetly want to make sure you have the newest SBLive drivers as well as the newest drivers for A3D and EAX. The A3D drivers are hard to find but I believe Winfiles will have them.
Also under your multimedia, make sure everything is set up correctly there as well. Maybe turn hardware acceleration down one level. Maybe DirectX is having a hard time running through, or maybe you need to turn it up because hardware acceleration is too low.
good luck.
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