The motherboard is an Intel Hazelton (D865GVHZ). It uses AC '97 audio. That's the drivers that are needed... if it is the drivers that are needed.
My friend has the T3990 Emachines and is having trouble with the multimedia audio controller. He says he needs drivers but we both couldn't find any.
Best bet would be to into Device Manager and delete the audio chipset, then let the computer "find" them and put the drivers back with them. Odds are that that will fix the problem.