The machine details are sketchy, the OS not noted but I'll try.
Be sure the IDE channels are in DMA mode. Read http://winhlp.com/node/10
Consider if the OS was changed from stock there can be missing motherboard drivers. Find and install those.
Good luck and sorry but I can't find enough detail to hazard a better guess. You could be on dialup or "other."
I have a Dell desktop with a SoundMAX Digital Audio sound card. When
playing any of the media players, Windows Media, Real Player or any video sites such as youtube, the sound is scratchy and garbled. I've been told it is not the card, but some adjustments that need to be changed. Other than adjusting the volume control which doesn't help, I have no clue as to where to start fixing the problem. It is urgent I get it fixed. Can anyone help?