Which version of Windows is installed on the computer? Are you aware of any changes made to the computer, prior to the issue? Method 1: I would suggest you to refer to the following link.
Error 1722 when reinstalling Flight Simulator X Method 2: Refer to the following link. Flight Simulator X: “An error occurred while attempting to activate the product The problem may be due to an incomplete installation of the application” Method 3: If the above step fails then refer the below Microsoft article and try the steps mentioned. Error message when you install Microsoft Games and mapping programs For additional support contact the Flight Simulator Solution Center. Hope this helps.