The command and response:
C:\Users\Jason>ipconfig
'ipconfig' is not recognized as an internal or external command, operable program or batch file.
Solution
Right click My Computer > Properties
Advaned System Settings
Advanced tab > Environment Variables.
In text list under system variables, double click variable named "Path".
Add text "C:\Windows;C:\Windows\system32" in variable value at the end.
Restart the command prompt.