Only white screen shown when start Photoshop 2020
When I start all Adobe programmes including Photoshop, Premiere Pro, Illustrator from my office computer, it has not been working at all, which had worked well for a couple of weeks. It shows only white screen without anything as shown in below screenshot:

I tried my best to find out the solution, by (1) uninstall all current Adobe product including the Illustrator, (2) install them again, (3) Press and hold "Alt," "Control" and "Shift" at the same time as the program launched, and delete all current settings (4) press print screen to capture (5) uninstall current products and install old version and upgrade it..... all measures I tried, but no vail.
I desperately need to work Photoshop and other Adobe programmes on my working computer in the officer.
Thank you for your support.
