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Check C:\Windows\System32\Drivers\etc for a file named HOSTS with no
extension. (Not Hosts.sam)
Make sure Windows is set to show hidden files and folders and is NOT set to
hide extensions for known file types.
If HOSTS exists, rename it to HOSTS.OLD
Reboot an try again.
Or, In a Cmd window, enter
ipconfig /flushdns
then clear your TIF also, and re-boot.