Can i run php script using command prompt in any location by typing scriptname.php

Hi,
       I have downloaded ZendServer-CE-4.0.3-Windows_x86.exe(49.6 MB) and installed it in C:\Program Files\Zend derectory .Whenever i want to run any php script i have to put my php script in C:\Program Files\Zend\ZendServer\bin directory and then by the command prompt first i goto in C:\Program Files\Zend\ZendServer\bin location and then i type php scriptname.php. after doing this i get the output from php script.
      I want to ask that can i run my php script by simply double clicking or by command prompt only by typing scriptname.php in any location.
-Ravi Joshi