My Adobe Premiere 2020 program worked great until I upgraded from Windows 10 to 11. Now it comes up with the opening page but when I click on Editor it starts to load but stops almost immediately.

>I stated all the details already

Actually, you did not… what brand/model video card?

Do not count on Windows to be fully up to date when it comes to device drivers
Go to the vendor site to be sure you have an updated driver for your graphic adapter
There have also been reports in the past that the latest driver is not the best driver
.
Also check (copied link) https://www.tomshardware.com/reviews/gpu-hierarchy,4388.html
Puget page has desktop and laptop computers... expensive, but at least some good ideas
https://www.pugetsystems.com/solutions/video-editing-workstations/adobe-premiere-pro/hardware-recommendations/
.
https://helpx.adobe.com/premiere-pro/kb/gpu-and-gpu-driver-requirements-for-premiere-pro.html
.
nVidia Driver Downloads https://www.nvidia.com/Download/index.aspx?lang=en-us
-for all Adobe programs use the STUDIO driver, not the GAMING driver
-To achieve the highest level of reliability, Studio Drivers undergo extensive
-testing against multi-app creator workflows and multiple revisions of the top
-creative applications from Adobe to Autodesk and beyond
.
If you have a laptop you MAY also need to check for a laptop specific nVidia driver
-SOME laptops require an approved driver from the laptop company, not nVidia
.
AMD/ATI Driver https://www.amd.com/en/support
.
Intel https://downloadcenter.intel.com/product/211969/Intel-HD-Graphics-Family
https://www.askwoody.com/newsletter/free-edition-working-with-the-intel-driver-support-assistant/
 

Did you reinstall the program after your OS upgrade? That’s a good idea.

Meantime, try right-clicking on the icon and selecting Run as Administrator.