So for the past few months I’ve ran in to the same issue over and over. Windows 10 Feature update would stop and lock up at 76%. Some others on the Microsoft forums suggested waiting for 2 days with success. I myself can’t wait 2 days for my PC to free up from updates. I read about the possibility being the fact that I have my documents, pictures and downloads mapped to a 2nd drive instead.
Here is a possible fix, at least it fixed my problem.
- Create a new Administrator account.
- Restart you PC into the new account.
- Go to settings and updates, click update or restart depending on how far along the updates already are.
- Once the updates are started it should restart and finish installing them successfully.
I hope this helps others as it was annoying me to no end.