Windows 8 & 10

and Windows 10 are two different operating systems.
Hold down the R key while you click the Windows logo.
The run box is visible.
Type cmd into the run box and press the Enter key.
Enter the following command in the pop-up command prompt:
Ipconfig /flushdns C:Usersusername>
The command completes and the prompt is returned.
To close the window, type exit followed by the ‘Enter’ key.
When departing the Windows command prompt, you may encounter a pop-up box stating that Windows “…cannot finish the program because it may still be operating…” — clicking the End Now button to exit is totally safe (and essential).

Windows 7

is the latest version of the Microsoft operating system
Then, in the search bar (where it reads “search for programs and files”), type “cmd.”
Enter the following command in the pop-up command prompt:
Ipconfig /flushdns C:Usersusername>
Repeat the operation twice more by pressing the ‘Enter’ key.
To close the window, type exit followed by the ‘Enter’ key.