PHP Strangeness

A few days ago, IMeanWebHosting ran a system update. (I rent hosting space from them.) For some reason or another, the update reset PHP settings, including extensions, upload limits, and their ilk.

My website was replaced by a one-line message:

Fatal error: Class 'PDO' not found in /home/nitkinne/public_html/includes/database/ on line 184As exciting as single-line errors are, they don't quite meet mettle for my website.