Windows 10: Command prompt lost many useful commands

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?

:)

 

command prompt will not open in safe mode with command prompt

Would I just follow the same steps within safe mode after hooking up to the other system?

 

command prompt will not open in safe mode with command prompt

I am repairing a laptop for a friend and I need to access windows in safe mode and the owner has forgotten the password to the main user. I tried logging on with the administrator profile in safe mode but it is not showing up so I was going to use command prompt in safe mode with command prompt but command prompt will not open when I boot that option. Does anyone have any hints for me to figure this out?

 

commands in command prompt

Many of the commands one can use in Command Prompt go back to the days of DOS/Disk Operating System. An example of how to use switches in chkdsk can be seen by typing chkdsk /? at the command prompt. There's a number of Web pages about the commands found by a Search:
dos commands list at DuckDuckGo
Some pages aimed at Win10:
windows 10 commands for command prompt at DuckDuckGo