Choose Properties after right-clicking on the desktop Steam icon. If you have Windows 10 and can’t run FNV without experiencing issues, here are some more things you can do. You might even have considered downgrading to Windows 7. This means there is an error with Windows 10. When (and if) you contact support, they will ask for your MSInfo and your DXdiag. You could also try to play the game in admin mode. You could try playing in Compatibility Mode with a number of different OS, such as Vista Service Pack 2, Windows 8, and Windows 7.