Illustrator crashes when opening any file after Microsoft Cumulative update 2019-09 KB4517211
Running Win10 Pro x64. Uninstalled and ReInstalled Cumulative update KB4517211. Problem goes away if uninstalled, and recurrs after re-installing Microsoft update. Have latest NVidia GPU drivers installed (problem occurred with prior version graphics drivers as well) and latest version of AI (23.1). Problem occurred prior to update to 23.1 today. Problem started after Microsoft Cumulative update for Windows 10 Version 1903 x64 and problem is resolved when uninstalling Cumulative update. Used Microsoft tool to HIDE updates to stop KB4517211 from re-installing.
Tyler Caine commented
I had the same issue with Microsoft cumulative update KB4524149 (dated October 4th). Illustrator 2018 would open, but would crash upon trying to open any files. I could open files in safe mode, but not in a clean boot. My tech knowledge isn't enough to know why the update conflicts with Illustrator, but eventually I uninstalled the update and Illustrator works fine again.