Missing Ethernet Controller/Multimedia Audio

Hello, my friend has recently just lost his Multimedia audio controller driver causing him to lose his sound, while i was attempting to download some possible fixes, I restarted the computer causing him to also lose his Ethernet controller driver(How? I have no idea). His specs are

Computer:
AMD Athlon 64 processor 3200+, 2.00GHz

System:

Microsoft Windows XP Professional Version 2002

Does anyone know where I could download the correct Ethernet and Multimedia Audio Controller drivers?