How to Enable or Disable Windows Recovery Environment (WinRE) in Windows 10
Windows Recovery Environment (WinRE) is a set of troubleshooting tools available under advanced startup options in Windows 10. These tools are useful if you have some issue that you cannot fix in the regular Windows 10 environment, for example, you may need to overwrite or delete some in-use files. It is really a good alternative to a bootable DVD or USB stick.