Solve Win8 system DOS command prompt failure problem

DOS command prompt is a function we often need to maintain the system, it can be said that it is very important to the system, especially when the system encounters some serious problems, Under normal circumstances, we can solve the DOS command prompt. Today, ghost win7 tests the network connection with the command prompt, but suddenly finds that no matter what command is entered, it will prompt "not internal or external commands, nor running programs or batch files", all commands at the command prompt are Invalid! What is going on? 1. Open the traditional desktop, right click on the computer and select Properties. 2. Select Advanced System Settings under the left control panel home page. 3. Select an environment variable. 4. Find the variable Path and choose Edit. 5. Modify the variable value to “%SystemRoot%System32;%SystemRoot%System32WindowsPowerShellv1.0”, then save and exit, restart the computer and try it.