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Follow this step-by-step tutorial to learn how to disable IPv6 on Windows 7.
Go to Start > Control Panel > Network and Internet.
In the “Network and Internet” window, click on “Network and Sharing Center”.
Click on “Change adapter settings” (1).
Right-click on your active network adapter (Ethernet or Wi-Fi) (2) and click on “Properties” (3).
Scroll down until you see “Internet Protocol Version 6 (TCP/IPv6)” (4) and un-tick this checkbox.
Click on “OK” (5).
Restart your computer and the internet router for the changes to take effect.