Has anyone used Magento to create an online e-commerce site on vodahost?

Hi I tried few day ago, install the magento-check.php and say this to me:

You are missing the mcrypt extension
You are missing the pdo extension
You are missing the pdo_mysql extension

The following requirements were successfully met:

You have PHP 5.2.0 (or greater)
Safe Mode is off
You have MySQL 4.1.20 (or greater)
You have the curl extension
You have the dom extension
You have the gd extension
You have the hash extension
You have the iconv extension
You have the pcre extension
You have the simplexml extension

I was looking for the tree first lines if you have a solution....