What is the solution when the Win7 system prompts "not internal or external commands"?

With the Win7 system, when you enter the command prompt state, no DOS commands are prompted: * * is not an internal or external command, nor is it a running program or a batch file. So what is it that causes this problem to happen?

First, this occurs because some software modifies the value of the path. The solution is very simple, the right mouse click My Computer → properties → advanced system settings → environment variables, see what is inside the path value? For example, some software will be changed to C:Program Files (x86) Stormiicodec; C:Program files (x86) Stormii, also remove the real system file address.

Now you add%systemroot%system32;%systemroot% to the value of path, which solves the problem.