Self-extractor. Download the file then doubleclick on it to start unpacking the drivers. After unpacking the files Right-Click on My Computer and select 'properties', then select the tab 'device manager', where you can select the audio device (either PnP Audio Device or ESS Solo 1E). Now click the 'properties' button.

In the device properties select 'drivers' then 'update driver'. Choose to manually select the driver after which you can click 'Have Disk'. Browse to the directory where you unpacked the files to - by default this is set to c:\windows\temp - and click OK.

You should see the driver now, select it and click OK . The new driver will be installed.