If you are looking for a way to completely reset or restore the Windows Registry (regedit.exe) to its default settings, then the only known safe way to do this is to use the Reset This PC option ...

This is an undesirable program. This file has been identified as a program that is undesirable to have running on your computer. This consists of programs that are misleading, harmful, or ...

After running the Microsoft Safety Scanner tool, if you are still not able to open the .exe file on your computer, then you need to reset the registry settings to their default settings.