DaVinci Resolve won't open.

I had 16.2 installed on my PC and used it for months. Absolutely no problem.

Today, I've gone to open it, and it won't open.

I've uninstalled and reinstalled it (now installing 17). Same problem.

I've tried various solutions, including:

-- that the process is still in the Task Manager and needs to be closed. It's not. (As an aside, when I try to run Resolve, I see it pop up in the Task Manager, stay there for a few seconds, and then come up with SUSPENDED under its status. Then it disappears.)

-- uninstalling it, and deleting leftover folders from Program Data, Program Files, et al, and then reinstalling. Nope.

-- unplugging everything on my system, except for the mouse and the keyboard. (As it is Resolve never had a problem previously with anything.)

The only recent changes to my system are installing a second monitor, and I believe Windows executed some minor update. (And I have ditched the second monitor, but Resolve still won't open.)

Any solutions?

Uninstalled 17, and reinstalled 16.2.8.

Gets to the tour, then the set-up, then I get the error message ...



If I try boot it up, I can see it sitting in Task Manger, but it doesn't boot up.