By default Windows hides certain files from being seen with Windows Explorer or My Computer. This is done to protect these files from accidentally being modified or deleted by the user. Unfortunately viruses, spyware, and hijackers often hide there files in this way making it hard to find them and then delete them. By following the steps below for each version of Windows you will be able to change the operating systems behavior so that you can see hidden and protected files. In this way you can delete or replaces files for troubleshooting purposes.
Source: https://www.bleepingcomputer.com/tutorials/how-to-see-hidden-files-in-windows/