If you are running an older OS like Windows 7, you may need to manually inject SATA/AHCI drivers during the installation process to see your hard drive.
If the Realtek driver is installed but you hear nothing, check that the "High Definition Audio" controller is enabled in the BIOS. samsung q67s1 motherboard drivers
Many motherboard drivers require a full system restart to hook into the Windows kernel properly. Troubleshooting Common Issues If you are running an older OS like