I am sorry but lightroom is not running in taskmanager. Soo the problem remains.
hold down the Alt/option key and click on Lightroom and check, does it give you any prompt.
If not simple uninstall it, restart the machine and reinstall it back from the Creative Cloud Desktop App.
I am very sorry, but it does not work. After i uninstall and then re-install lightroom i get the same problem.
There is something that gets in the way of launching lightroom. but i do not know what it is.
Photoshop cc works perfectly.
I am very grateful. This was the correct answer.
Again, thank you very much.
With kind regards,
Glad to know it worked for you.