Execute dotNetInstaller.exe and accept the default settings.
If you experience installation problems using the dotNetInstallation.exe, you can use this alternative installation method.
Execute SQLite\SQLite-1.0.65.0-setup.exe
Start Navistools2013.msi and accept the default settings.
After installation start Navisworks in the usual way. You will find the installed programs in the Add-Ins Ribbon Tab.