I ran the freeware utility DiverUpdater Pro for my system (mobo: ASUS A8N-E)
and it stated that the following drivers need to be updated
NVIDIA nForce Parallel ATA Controller v5.10.2600.0666
NVIDIA nForce Serial ATA Controller v10.3.0.46
RealTek AC'97 Audio v5.10.00.6300
Sound Blaster Audigy v.5.12.01.514
I searched for them over the internet and found many sites providing the setup.
But I am afraid they might contain viruses/malware.
From where can I obtain malware-free drivers for the above components.