Almost all soundcard currently on a laptop uses Realtek. Generally the quality is lower than the bigger soundcard manufacturer such as Creative. But, Realtek has also provided HD quality.
With an Audio Card and supporting driver, Realtek now is able to generate the sound quality of 10 Channel which is 7.1 channel playback and 2 extra channels which are independent outputs (multiple streaming). The other advantages are the drivers available for Windows operating system or even Linux which can be downloaded from its official website.
Below this posting you can get the direct download link for “Realtek HD Audio Codec 2.62” and “Realtek HD Audio Driver 2.62” for Windows XP, Vista, Windows 7 and Linux. And it is strongly advised to frequently update your driver on your computer.
Download : Realtek HD Audio Driver 2.62 for Vista, Windows7 Driver (32bits)
Download : Realtek HD Audio Driver 2.62 (All Version) – Windows XP/2003(32/64 bits), Vista x64, Windows 7 x64, Unix (Linux)