I was trying to uninstall WP Super Cache. It seemed to make some posts disappear en appear again and I was trying to figure out the problem and after following the uninstall instructions and clicking 'deactivate', the site went down.
Apparently, all the content in the wp-content folder was deleted. In the wordpress admin panel I can still see all my posts (thank god ;)), but the plugins are all gone.
Also, the backup I made yesterday was deleted. (what a day...)
Now I'm a complete novice at wordpress and everything, but I'm trying hard to learn how to deal with it. Does anybody know what I did wrong and knows what I have to do to get the site back up?