Example: If your motherboard is the Gigabyte GA-G31M-ES2L (common with E2200), download the Realtek Function Driver for High Definition Audio from Gigabyte’s site.
If you download a driver meant for a different motherboard, it will not work. The solution isn't finding a driver for the CPU, but finding the driver for the motherboard that the CPU is plugged into. Intel Pentium Dual Cpu E2200 Audio Driver Download
Download CPU-Z and check the Mainboard tab for the Model and Manufacturer. Method B (Device Manager): Right-click Start > Device Manager . Expand Sound, video and game controllers . Right-click the audio device > Properties > Details tab. Example: If your motherboard is the Gigabyte GA-G31M-ES2L