Switch to Dx11, Dx12 isnt working well in Division2
If it crash again go to windows event viewer (it is pre instaled) application --> there will be time stamp and date of an error with description of what caused the game to crash.
There is also a *.dmp file created after the crash. It has more detailed info about the cause, but to open the file you need 3rd party program.
In my case, it was nvidia driver causing the crash.
Best is to perform CLEAN instal of the driver, and by clean i mean uninstall in safe mode with 3rd party app. If you uninstall only by nvidia uninstaller, it doesnt help beacouse there are still some leftovers.