denfriskadiabetikern

Thanks.The problemes are solved:
1) I removed W3 Total Cache. It sorted out the problems with config.php
2) Mailchimp extension was there without beeing seen among installed plugins. I just deleted the lib and installed it as a new plugin.
3) It was samed with mailpoet. I have never installed it. I deleted the wysia lib and installed mailpoet easy forms as a new plugin.

W3 Total Cache and mailpoet seems to have security vulnabilities.

Thanks once again.

Actually after replacing wp-admin only 6 files are left:

wp-content/themes/index.php
wp-config.php
wp-content/w3tc-config/master-admin.php
wp-content/plugins/index.php
wp-content/uploads/wysija/themes/mailp/index.php
wp-content/index.php
Can any of those files be replaced directly? I guess the wp-config needs more attention.

Now only few files left:
wp-content/themes/index.php
wp-admin/css/nav-menus.php
wp-admin/css/ms-themes.php
wp-admin/css/my-sites.php
wp-admin/css/ms-users.php
wp-config.php
wp-content/w3tc-config/master-admin.php
wp-admin/css/ms-upgrade-network.php
wp-admin/css/network.php
wp-content/plugins/index.php
wp-content/uploads/wysija/themes/mailp/index.php
wp-content/index.php
wp-admin/css/ms-sites.php

css files under wp-admin. Example: wp-admin/css/nav-menus.php, wp-admin/css/ms-themes.php and so on …

I tried with a another widget just see if it makes any difference.
It is the same result. I am using wordpress 3.9.1. Can it be a problem with this release of wordpress?