From the My Games tab right-click on the game and select Properties from the menu.An excellent method of doing this is a tool you can find here.
Some steps to take before you attempt any fixes. If you have any solutions or suggestions that aren't listed here than if you could kindly post in the comments box you, would be credited and I would be very grateful.
There are fixes however, and this guide will help you in getting the most out of your Fallout game. Since you're here, that probably means that you are the victim of one or more of these afflictions. While Fallout: New Vegas is an excellent game it is also right with bugs, glitches, and performance issues.