Hi Davido,
Thank you for reaching out to Microsoft Community Forums.
From the issue description, I understand that windows update is stuck at 30%.
Let me go ahead and help you with the issue.
Please answer these questions, which will help us in assisting you better.
1. Did you make any changes to the computer prior to the issue?
2. What is the KB number of the update?
I would suggest you to refer to the link and follow steps from this article:
Note: (Please ignore In-Place Upgrade.)
Hope this resolves the issue. If issue persists, you can write to us and we will be glad to assist you further.