RESPONDA:
Please follow the steps below in order to flush your DNS cache. For each version of Windows, we recommend that you run the command prompt as Administrator user due to system security permissions.
Windows 10 introduced the Windows PowerShell to replace the Command Prompt and enabled it by default. You can find out more in this dedicated Microsoft article.
Windows 10
2. Right click on the start menu and choose Command Prompt (Admin)/ Windows PowerShell (Admin) from the menu.
3. Type in the command ipconfig /flushdns
Windows 8 / Windows 8.1
2. Simply type cmd and the Windows search bar will appear on the right hand side with search results.
3. Right click on Command Prompt and click Run as administrator.
4. Type in the command ipconfig /flushdns
Windows Vista / Windows 7
2. Make sure that you right click on the command prompt application and choose Run as Administrator.
3. Type in the command ipconfig /flushdns
Note: It is also possible to type in cmd into the Windows Vista / Windows 7 start menu search field and then right click on the cmd.exe result rather than having to navigate through the various sub-menus.