localhost website download a file, don't start (no replies)

Hi friends

I export the mysql database from my host, updated wampser.64bit to 3.1, the files in my subfolder eg myweb under wamp64/www are identical to host except for configuration.php

When i browse localhost/myweb i got the following message. Even use /administrator, same download occurred. Please help. Thank you first.

I can open no problem with another website in wamp64 with virtualhost created using the option within wamp.


/**
* Define the application's minimum supported PHP version as a constant so it can be referenced within the application.
*/
define('JOOMLA_MINIMUM_PHP', '5.3.10');

if (version_compare(PHP_VERSION, JOOMLA_MINIMUM_PHP, '<'))
{
die('Your host needs to use PHP ' . JOOMLA_MINIMUM_PHP . ' or higher to run this version of Joomla!');
}