can not use grunt command in windows DOS

I have successfully installed nodejs in my Windows system , and was able to use the node - v and NPM - v command.And my successful use of NPM - g grunt - cli command to install grunt,but when I input the grunt commands in other project But warned no global variables of grunt, why?

When I installed Express and Node on Windows I think I might have had to go into the Control Panel -> System Properties area (Advanced Tab) and append some things to my path. Environment Variables -> System Variables -> Path

I appended all these things somewhere along the way: C:\Ruby193\bin c:\python27 c:\python27\scripts C:\Program Files\nodejs C:\Program Files (x86)\Git\cmd