Command prompt lost many useful commands

[Mr Biscuit Aardvark]

Hi thereCMD on my Windows 10 PC has lost many useful commands.If I type dir it lists files in the current directory. It also responds correctly to cd, copy, eraseBut most other commands are lost. For example, help gives this response:'help' is not recognized as an internal or external command, operable program or batch file.I also get this response to other useful commands, such as findstr, xcopyHow do I restore all commands to the CMD prompt? Where did they go?

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