Wow, talk about a trip back in time. This was used on old ASUS P5 boards like 10 years ago.
I think that you can find it more easily by searching for the specific Realtek driver though, like
THIS one that I found in a search for realtek rtl8187l driver windows 7. Give the link a minute or so and it will pop up a window to download the zipped driver.
Good luck!