Warning: require(libs/Smarty.class.php) [function.require]: failed to open stream: No such file or directory in D:\WebSite\csr\install.php on line 3

Fatal error: require() [function.require]: Failed opening required 'libs/Smarty.class.php' (include_path='.;C:\php5\pear') in D:\WebSite\csr\install.php on line 3