This appears to be an issue with user account permissions affecting Windows 'local' user accounts (those not using a Microsoft account tied to their Windows account).
Download any free app from the Microsoft Store. Downloading a new app appears to reset the licences for the currently logged in profile and can fix the problem.
Convert the local account to a Microsoft account in the User Settings area of the control panel. You can covert it back to a local account through a similar process in User Settings.
Async compute is known to cause system crashes, even on new hardware. Disabling async compute in the graphics options should fix the freezing/crashing issues. Those who experience crashes using a Nvidia card should download Display Driver Uninstaller, run in safe mode and update to the 398.36 driver which contains a potential fix. Fix effectiveness has not yet been ascertained.