Note that this driver is for a Windows XP / XP 64 bit operating system. There are other drivers on this website where you could find a Windows 8 driver. This is only for Windows XP both 32bit as well as 64bit operating systems. Download the driver file below.
If you are not sure which hardware you have then you search this website for more drivers from Realtek. The driver file below is directly from the Asus website. Note that this driver was released in 2008 when Windows XP was the only system around at the time. Download the file below.