Trouble with wp-load.php

Hello everyone,

I had this site up and running for a long time now, tacet.fr, and now, for some reason, (you’ll say update related stuff I guess) I can’t even access the admin anymore.

Here’s the error message I get :
“Warning: require_once(/web/sites/clarahost-fr/0/155/178616/public/www/wp-load.php) [function.require-once]: failed to open stream: No such file or directory in /web/sites/clarahost-fr/0/155/178616/public/www/wp-blog-header.php on line 12

Fatal error: require_once() [function.require]: Failed opening required ‘/web/sites/clarahost-fr/0/155/178616/public/www/wp-load.php’ (include_path=’.:/usr/share/php:/usr/share/pear’) in /web/sites/clarahost-fr/0/155/178616/public/www/wp-blog-header.php on line 12″

Obviously it asks for file that I can see being there when I access the folder trough ftp.

Any idea what may get me out of this?
Cheers!