Why would we want to do this? Well, if you have a Graphics Driver problem, it might cause Navisworks to continually crash when you start the program. If you head into the Options Editor, you can go to Interface - Display - Drivers and disable various options until Navisworks decides to load up again.
For example, try unticking everything except OpenGL - you might find that Navisworks can now load (this tip may particularly help if you are trying to run Navisworks in a virtual machine).
Another stable choice may be to select only the software-mode drivers: