Win7 system cmd command not available solution

Originally can use the cmd command, suddenly prompted: "Not internal or external commands, nor can I run a program or batch file" and can not be used how to do? The following small series for you to introduce the CMD command can not use the solution.

1. We need to set the following in the system environment variable:

Variable Name: path

Variable value:%systemroot%system32;

(Keep the original content, add the variable value at the front, do not forget the semicolon, her role is to separate the variables)

How to set system environment variables:

1.win7 System, we open the System properties, click on the left list of advanced system settings, and then switch to the Advanced page, click on the environment variables below;

2.XP System right Desktop My Computer icon, select Properties, select Advanced, click on the "System environment variables" below