DEP - Enable or Disable
I have two other solutions which MAY fix IE. The first is easy, type in search, turn windows features on and off. Then click on it. You will be taken to a screen that show IE checked, uncheck it. Then turn off computer, boot up and check the box again. See if it works this time. Before trying anything make a system restore point, to be safe.
If that does now work, you can download a new broswer such as Firefox or Chrome.
Will this work, I do not know. But if you make a system restore point, you can easily return to where you are now and we could thinkg again.
I do have other solutions, but lets try the easy ones first.
Wishing you luck