Latest update self installed 2 days ago, after which Firefox would not run. Tried restart and shut down, but it would not even open. System restore cured problem. Then it tried partial update, which failed. Full update caused same problem, so ran system restore again. This morning partial update failed again. Run Glary utilities Pro once a week, everything else working to spec, this is the only update that has caused such problems. Even tried uninstalling Firefox, and new install, but problem still the same. I have no doubt that when full update is installed problem will return.