Hello T Suominen,
Thank you for keeping us updated and I would appreciate your efforts to resolve the issue.
As we have exhausted with all of the steps, so now I would suggest you to perform a Refresh on your computer and check the status.
Disclaimer:
Check this article and refer the warning section, you can copy the warning section as the disclaimer when you provide Refresh or Reset in Windows 8 or Windows 8.1
http://windows.microsoft.com/en-in/windows-8/restore-refresh-reset-pc
You can refer to the link provided below to perform Refresh on your computer.
How to refresh, reset, or restore your PC
http://windows.microsoft.com/en-us/windows-8/restore-refresh-reset-pc
Hope this would help. If issue still persists post back with current status of your computer and result of the proposed suggestion, we will be happy to assist you.
Thank you.