This is going to sound strange but it worked for me. I too had a problem with a Realtek driver corruption. Deleting the driver in Device Manager would not delete it. Installing a new driver on top of the corrupt one would result in sounding like crap.
I deleted the Realtek drivers found here:
Program Files (x86)/Realtek/Audio/Drivers
Program Files (x86)/Realtek/Audio/InstalShield
Some files can not be deleted, that's OK, delete everything that will in those folders.
Then reinstall the Realtek Version 184.108.40.20643.
This fixed my corrupted audio driver, hope it works for you.
Let me know.
G752VSK, G75VW-3D, G51J, G1S
Homebuilt Windows Server