All it once my site stopt working?

PS: my website link is http://www.deheuvel.be

Hi there,

Before moving your website to the root directory, did you change your Site URL and Home URL in "Settings > General"?

If not, you'll have to set them either through the database, or like this: http://codex.wordpress.org/Changing_The_Site_URL

Set the Site URL to the new URL (since you switched directories) - and you should be good to go.

Also, you may need to replace URLs within your content to the new URL - I suggest this plugin: https://wordpress.org/plugins/velvet-blues-update-urls/

Hope this helps :)

Hey Tom!
Weird thing is I DID all these things! Everything was fine at first but after an hour or so everything got lost? And I didn't change anything in settings, only thing I was doing was changing my settings in Google Analytics?

Hmm, so when you try to go to your website it's a 404 error? Or?

Hey Tom!
Weird thing is everything was working correctly for more than one hour! Then I started editing my settings in Google Analytics and everything went wrong? Is it possible my wordpress just cannot acces the database at the moment?

Everything fixed :)
I know where I went wrong: while changing for the first time I did something wrong and had to undo my actions with following code:

<blockquote>If You Have Accidentally Changed your WordPress Site URL
Suppose you accidentally changed the URIs where you cannot move the files (but can still access the login page, through a redirection or something).

wp-login.php can be used to (re-)set the URIs. Find this line:

require( dirname(__FILE__) . '/wp-load.php' );
and insert the following lines below:

//FIXME: do comment/remove these hack lines. (once the database is updated)
update_option('siteurl', 'http://your.domain.name/the/path' );
update_option('home', 'http://your.domain.name/the/path' );</blockquote>

And I forgot to remove this line :) probably after accessing wp-login, it changed directories again. I'm sorry for my hysterical reaction :)

Glad you fixed it! :)