To reset the DNS resolver cache, perform the following steps:

  1. Hold down the Windows key and press “R” to bring up the Run dialog box.
  2. Type ipconfig /flushdns then press “Enter“. (be sure there is a space before the slash)
    Windows Flush DNS command

If you are asked for admin privileges please enter the Admin user name and password. 

That’s all there is to it. A command box will flash on the screen for a split second and the DNS Resolver cache is cleared.