SETP1: Download Latest version of Yii Framewrok from official website (http://www.yiiframework.com/).
SETP2: Extract The Giz.
SETP3 : OPEN command prompt, type
cd / hit enter
cd xampp/php hit Enter
cd php.ext c:xampphtdocsframeworkyiic webapp c:xampphtdocs hit heter
type yes hit enter
wpDiscuz