Win7 system dos command can not be used how to solve

  
 

First right click on the computer, open the properties, and click Advanced System Configuration.

Click the Advanced tab to open the environment variable.

Select Path in the system variable, click Edit, type the following values, and save.

%SystemRoot%system32;%SystemRoot%;%SystemRoot%System32Wbem;%SYSTEMROOT%System32WindowsPowerShellv1.0

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