How to reset ACDSee database index and thumbnail cache files
: Some users have found that if you simply drag the error window out of the way or click back into the main ACDSee window without closing the error message, the program may remain functional. Isolate the Startup Folder
ACDSee uses components like Microsoft Edge for certain interface elements. If Edge has been uninstalled or disabled, the program may crash instantly. 4. Advanced Clean Reinstall
If none of the above works, ACDSee Support will need a "Crash Dump" file to diagnose the specific system error.