To install, first run the exe, this will unpack the drivers and attempt to update the system. If you get the error continue with the following steps.
Go into Device manager, right click on the Audio device and select properties.
Then select the driver tab and the "update driver" button.
Then "Browse my computer for driver software".
On the next screen, browse to or enter the directory the driver was unpacked into. This is normally "c:\dell". Make sure the "Include subfolders" checkbox is checked. Then click "Next".
The drivers should be installed.