Win7 System cmd command error prompt not internal or external command

1, at the same time press "Win" key + "R" key to pull up the run window, input "path%windir%system32", basically can solve the problem.

2, if after the reboot is still unable to use, also need to right-click the "Computer" select Properties, and then select Advanced System Properties, and then click on "Environment variables" to see "windir" value is how much, it is best to modify the system defaults, if there is no "windir" this item, Create a new variable with the same name.

This is to solve the cmd command line entered any command, are prompted "is not internal or external commands, nor is it a running program or batch file" solution, there are users who encounter this problem, this method to solve it.