Problem with admin access after WordPress update to 4.0.4

Wordpress has updated to version 4.0.4 and It seems there is a problem in the admin panel because it appears like it doesn´t have the css file.

I can´t do anything in the admin section.

@walter

Please make sure to use the latest version of WordPress which is is 4.2.1. It will make your website much more secure. It might help you with this issue as well because update will replace all WordPress files.

If not try to disable all plugins and check your hosting error logo to see if your site throws any errors or warnings. If you don’t know how to do it just make sure to update WordPress and contact your hosting provider explaining what is going on.