Support Alert: Installation Error 1722 
 
 
If you see this error when attempting to install or reinstall Microsoft Flight Simulator X, it means that a general system-level failure has occurred while running Setup. This error is often, but not always, followed by an error message about registering fonts, and a 105 installer error. Microsoft Product Support Services has provided a Knowledge Base article about this issue, as well as a tool that provides a workaround.