I too tried all the suggestions - check router, restart, re-install. Spent two hours on the phone with support to no avail. Today took one of his suggestions: I created another Account on my Windows machine. Logged into that account and successfully opened Turbotax with no Error. Closed it and went back to my main account and voila TurboTax opened without issue and I am continuing to use it. This is a software bug that Intuit needs to find and fix. I've never had this issue with previous versions of Turbotax or any other windows app.
