After extracting the files on a location, just point to that location when windows asks.
Works for Buffalo USB WLI-USB-L11 wireless network adapter with Windows XP.
The following files are found inside the driver download file.
|WAMEL51B.DLL||159.7 KB||14 Nov 2002|
|WCMEL51B.EXE||69.6 KB||14 Nov 2002|
|WDMEL51B.DLL||7.7 KB||14 Nov 2002|
|WLMEL51B.INF||7.1 KB||5 Dec 2002|
|WLMEL51B.SYS||179.7 KB||14 Nov 2002|