My superior tried out some skin package but it was terrible and highly incompatible. When he went to try to remove it, there was no red X button by the extension for the skin or containers. I removed the files from the portal's folder and they are still appearing on the Extensions page for Skins and Containers listing. My superior tried reinstalling the skin package but it did not make any difference. Here are some screenshots so you can clearing see what I am talking about:

I just want them gone from those lists. I was trying to search through the forum but the Time outs are just too painful. I did find something about this being a known bug and it was fixed on 5.2.0. Also read that this lists are not constructed through database data (which i though would have been an easy but rough way to fix it). Would appreciate your assistance on this matter.

Yeah, my problem is actually in the HOST->Extensions list, not the admin. And yes, my DNN is 5.1.4 (3).  

Well to my understanding it is not in use, I will see if I can go through all the pages and confirm it. But why does the red X for removing extension appears for all the others?.... Is this a new feature for 5.1.4?