Airport Extreme error -4 when configuring from a PC | Mac

Connecting AirPort Extreme, Time Capsule or Airport Then launch Airport Utility and select AirPort Time Capsule or AirPort Extreme from the window and press edit. Select the ‘Wireless’ tab and find the drop-down menu under ‘Network Mode.’ Then select ‘Off’ to disable any wireless networks created by your Time Capsule or Extreme. Download AirPort Utility 5.6.1 for Windows AirPort Utility 5.6.1 allows you to configure and manage the new AirPort Express with simultaneous dual band 802.11n. For the latest information on AirPort software, check Software Update in System Preferences or the following Apple website: Apple Support Downloads How to Set Up the AirPort Extreme | Macinstruct Dec 26, 2011

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Installing airport express from a PC - YouTube Aug 30, 2011 AirPort Extreme Update 2007-001 Special Report "I too have been experiencing issues after installing Airport Extreme Update 2007-001 on my MacBook Pro Core Duo. There are certain locations in my home where WiFi access is non-existent. Prior to Apple A1521 AirPort Extreme Base Station Wireless Router