CorelDraw X8 won't open - still!

CorelDraw X8 has been working fine for 2 years on my Windows 10 MS Surface.  A few weeks ago it stopped opening.  I click the icon, I see the splash screen, then nothing.  No error message, it simply doesn't open.  Same thing with PhotoPaint and Font Manager.  I looked through the threads and found a similar situation from 1 year ago, where the fix was to download a txt file, rename the extension to .reg and run it.  I did so.  It didn't work, although now I'm having random system problems on my Surface.

I've tried running the 'repair' process, as well as uninstalling and reinstalling the suite.  No change.

Corel Support has been very unsupportive during all this. 

Any suggestions?  I REALLY need to get this working - I can't access any of my CDR files!

Thanks.