The other three recommendations which seem complicated are the only ones that work.
Select Start, enter "command prompt" in the Search Programs and files box, press and hold (or right-click) Command Prompt, and select Run as administrator.
At the command prompt, enter the following commands. Press Enter after each command.
ipconfig /flushdns.
ipconfig /registerdns
ipconfig /release
ipconfig /renew
Launch TurboTax.
