I'm running the latest release of Lightroom on the latest release of Windows 10. Every time that Lightroom generates previews on import, the program stops responding and has to be killed. This also happens after uploading to Flickr when it is downloading comments. Everything else seems to work fine.
I've uninstalled and reinstalled the application as well as disabled the graphic acceleration but neither of these helps. I've had no other issues with any other application so I am wary of simply reinstalling Windows on this computer.
I also just tried exporting unedited video files and the program stops responding. Ever since LR has been updated this regularly it has become a bug filled, unusable program that I am paying monthly for!
If this doesn't work - first remove all video files from your camera or in the folder you want to import, and then try to import.