Yii Installation Process over windows platform
Step1: Include php.exe path on environment "PATH" variable. eg: C:\wamp\bin\php\php5.5.12; (restart or log off your machine then)
Step2: Run the command on Command Prompt:
C:\yii-dir\framework\yiic.php webapp C:\wamp\www\your-project-name
Note: If the above process is not working then enter the bellow commands on command prompt.
C:\wamp\bin\php\php5.5.12\php.exe C:\yii-project-creator\framework\yiic.php webapp C:\wamp\www\yii-project