"ipconfig is not recognized as an internal or external command" or "sfc /scannow is not recognized as an internal or external command"

cause ::

ipconfig.exe should be residing in C:\WINDOWS\SYSTEM32 folder

Either the file doesn't exist or it's not in the required path i.e.there's may be a copy of ipconfig.exe sitting in the dllcache folder, if the original got deleted, in C:\WINDOWS\SYSTEM32\DLLCACHE

Solution ::

go to: Computer -> Properties -> Advanced -> Environment variables and replacing the PATH command (that somehow had been replaced) with C:\Windows;C:\Windows\System32

or

%SystemRoot%\\system32;%SystemRoot%;%SystemRoot%\\System32\\dllcache

This basically tells your PC to look in the Windows system32 folder for the file first