Application [Program Name] is not responding 

This error comes in all Windows versions, though error messages and options vary slightly for every operating system. In most scenarios, the cause mostly is the program that is having too long to respond than projected to complete its function. But before clicking 'End now' or 'Close the program', it's recommended to give the program a opportunity to finish what it is doing and only appears if a program is still running but attempting to do something difficult. If a certain program keeps producing this kind of error, it's recommended to check any updates or re-installing the program completely.