Widgets page and plug ins add page not working, and displaying differently

Suddenly two of the pages have changed how they appear. Not the typical WP Admin/Dashboard appearance. Instead, they are showing as bullet points in a long list.

When I click on the links from this page to POSTS or PAGES or SETTINGS etc I can go back to the normal WP display for these pages.

However when I click on Widgets and the add in button for Plug Ins they do not function.

I have uploaded a completely new WP set of files via Go Daddy. (By completely disabling the old account). However the problem is still there.

This happened all of a sudden while I was in the Widgets section. It froze and then appeared like this.

Help!