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Follow this step-by-step tutorial to learn how to disable IPv6 on Windows 8.
Press the Win + W keys to open up the Search window.
Search for “View Network Connections” (1).
Click on “View network connections” (2).
Right-click on your active network adapter (Ethernet or Wi-Fi) (3) and click on “Properties” (4).
Scroll down until you see “Internet Protocol Version 6 (TCP/IPv6)” (5) and un-tick this checkbox.
Click on “OK” (6).
Restart your computer and the internet router for the changes to take effect.