Often when you want to troubleshoot issues or keep a general check on your system health in Windows 10, you have to use Event Viewer. Event Viewer shows all the Windows events that get logged such as Information, Errors, Warnings and so on. Besides errors, Windows logs completely normal activities. This makes it harder to spot events related to things that aren't working as expected. So from time to time you may need to clear the Event Log in Windows 10.