I'm well aware these drivers are free but they took me 2 hours to download off their damn site so I thought I'd share them so you don't have to suffer like I did. These are for Vista and Windows 7 both x86 and x64.
This is the official driver package for Realtek HD Audio Solutions. It includes all driver files, and the control center for Realtek HD-Audio devices for Windows 2000, XP and Vista . The package includes the 32 and the 64 Bit binaries. Realtek HD Audio Driver is supporting all of Realtek HD Audio Codec in Vista/Windows 7/WinXP/Win2000/Win2003 : ALC882, ALC883, ALC885, ALC888, ALC889, ALC861VD, ALC660, ALC662, ALC663, ALC665, ALC260, ALC262,ALC267, ALC268, ALC269, ALC272, ALC273, ALC887.