I've seen a number of people asking about Realtek audio drivers lately, so you're not the only one. I recently had trouble finding them as well, though this driver page
seems to be up and available now. Still not good that so many are having difficulty. Considering the install base, I'm sure a very statistically significant number of people are accidentally downloading malware from shady "driver sites".
Speaking of install-base and nefarious intentions, the attack surface via Realtek's audio drivers must be absolutely colossal. They're on what, probably 95% of all motherboards? Seeing as how the drivers haven't been updated in over 2 years and the distribution method is haphazardly maintained, I doubt security is even on the radar. Important people should probably be concerned about that.