There is no exe in the zip file. This is a driver that is manually installed.
2 ways... if you are lucky, right-click the wdmaudio.inf file and select Install
If it doesn't install, go to Start>Control Panel>System>Hardware>device manager
Right-click the audio device with the yellow exclamation mark and select re-install driver.
browse to the folder you have the unzipped files in and follow prompts.