Installing the Realtek Audio Driver in Windows 7
If the file you downloaded is an EXE, just double-click and follow directions. When you’re finished installing, you may delete the EXE file as it already saved the necessary files elsewhere . If you're unable to delete it, do so after your next reboot.
If your download is another format, you’ll need to either update your driver (if you already have one installed) or do a clean install. The RealTek site offers installation instructions either bundled with your download (if it’s in ZIP format) or on the site as a separate “Read Me" file. Open this file and follow the instructions for Windows 7 installation (or Vista, if Windows 7 isn’t listed).
If instructions aren’t available, extract the files from your ZIP file (right-click and choose Extract All). When it has completed extraction, locate Setup.exe; launch it and follow the instructions. If you only have the DLL file with no setup program, save it to your C: drive, then go to Start > right-click Computer > Properties and select Device Manager.
Click on the triangle next to Sound, video and game controllers to expand the options, then right-click on the current driver and choose Update driver software. Choose Browse my computer for driver software and point it to the DLL file. It may uninstall the current driver prior to installing the new driver. Rebooting is not necessary unless specified.