Hi,
Welcome to Microsoft Community forum. Let me assist you with your concern.
- Are you facing issue opening Windows update or installing?
- Did you make any changes to Windows Registry?
- Which Windows update folder are you referring to in Windows Registry?
There are several reasons why the PC stops responding while it’s checking for updates, or while it’s installing updates. I would suggest you to Follow the troubleshooting steps from this Wiki article and check if it helps:
Windows Update Troubleshooting Guide - Windows 8.1
You may also refer this Microsoft article to troubleshoot the issue with Windows Update.
Troubleshoot problems with installing updates
http://windows.microsoft.com/en-us/windows/troubleshoot-problems-installing-updates#1TC=windows-8
Hope this helps. If you need further assistance with Windows, let us know and will be glad to help.