I found that Supplemental Language Support (files for complex script and
right-to-left languages, and files for East Asian languages) and Input
Method Editors (IME) were causing problems on one laptop here, so I
uninstalled them via Control Panel: Regional and Language Options:
Languages: clear the check-boxes for those two options.

But today I found that the laptop was having problems again, and I found
that the Supplemental Language Support had been reinstalled!

I don't know how that happened, but how can I block/prevent a future
reinstallation?

--John Hupp