Not able to run nginx command in E drive windows 7, but able to run from C:\nginx\

I have installed nginx in windows 7, location is C:\nginx. I am able to run nginx commands from this location, but not able to run nginx commands from another location. Set the system variable path as C:\nginx\nginx.exe, but still not able to run nginx command from other locations.

I have to run nginx -c "E:\GitHub\central-frontend\nginx.conf" -p "E:\GitHub\central-frontend\dist" or nginx -c "%cd%\nginx.conf" -p "%cd%\dist" from the location E:\GitHub\central-frontend\

Now when I run this command from E:\GitHub\central-frontend\ I am getting this error,

nginx : The term 'nginx' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again. At line:1 char:1

nginx -c "%cd%\nginx.conf" -p "%cd%\dist"
+ CategoryInfo : ObjectNotFound: (nginx:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException