You can try reset the Lightroom preferences back to default, refer: Preference file and other file locations | Lightroom CC and 6
If the above solution doesn't solve your problem then you can uninstall the Lightroom, restart the machine and reinstall it from the creative cloud desktop app.
I had the same problem, and so I followed your recommendation:
But after uninstalling and reinstlling LR 6.6 (standalone version) and downloading and running the Update ZIP file, I still get the same error message: "procedure entry point ucvtbase.terminate...." not found.
As a consequence, I cannot use LR at all, neither the previous version 6.6 nor the most recent version (6.10?) which U would have needed to edit files from Olympus EM1-II.
So I am totally frustrated.
What should I do?
Thanks, but unfortunately the suggestion did not work. The error message reappeared after installing the Windows vc_redist.x64.exe
I thend deinstalled LR, restarted the computer and then re-installed LR 6 (the copy that I had bought at the end of last year). It worked as it had done before the upgrade. But when I then installed the Update Zip to LR 6.10 (which I need for the Oly EM1-II), I again saw the error message and could not start LR.
Any other suggestion?