[SOLVED] Windows 8.1 - SFC, DISM, Windows Updates and Repair Install all failed

Alright, follow the instructions below please.

Step#1 - Clear Transactional Logfiles
Warning: this fix is specific to the user in this thread. No one else should follow these instructions as it may cause more harm than good, especially if the computer is not experiencing these exact issues. Do not attempt this fix unless instructed to do so. If you are after assistance, please start a thread of your own.
  1. Right-click your Start button and select Command Prompt (Admin)
  2. When command prompt opens, copy and paste the following commands into it one at a time and press enter after eachone. Type Y and press enter if you are asked "Are you sure?" to any line. Ignore any failure messages, they are perfectly normal and nothing to worry about.

fsutil resource setautoreset true %SystemDrive%\

attrib -r -s -h %SystemRoot%\System32\Config\TxR\*
del %SystemRoot%\System32\Config\TxR\*

attrib -r -s -h %SystemRoot%\System32\SMI\Store\Machine\*
del %SystemRoot%\System32\SMI\Store\Machine\*.tm*
del %SystemRoot%\System32\SMI\Store\Machine\*.blf
del %SystemRoot%\System32\SMI\Store\Machine\*.regtrans-ms


Then give Windows Update another try and let me know how it performs.
 
I ran those commands and ran Windows Update. Curiously, there were only 7 important updates found, down from 74 when I started having these problems (So we must be making some sort of progress?) But the Windows Update ran all last night for around 12 hours, seemingly stuck on 0%:

Windows Update not finishing.jpg

So this morning, I canceled it, then I rebooted and tried Windows Update again. This time, it finished pretty fast (about a minute or so) but only installed 1 out of the 7 updates, failing with error code 80070BC9:


Windows update 6 updates failed.jpg
 
Are you able to upload your WindowsUpdate.log and CBS.log for me? I'll check why it failed.

C:\Windows\WindowsUpdate.log
C:\Windows\Logs\CBS\CBS.log
 
It seems like a restart is required. Therefore, please restart your computer, and once done, run Windows Update again. If updates fail to install, please upload the WindowsUpdate.log and CBS.log files for me again.
 
Alright, can you let me know which updates you are trying to install right now, their KB number?
 
Sure - Here's a screenshot of the important updates selected to install plus their KB numbers.
Windows Updates important.jpg
 
Can you try to install the second update, "Security Update for Windows 8.1 for x64-based Systems (KB3132372)", only and if it fails, upload the CBS.log and WindowsUpdate.log again for me to check? Make sure you uncheck the other updates under both the Important and Optional tab.
 
Alright, do you have your Windows installation media?
 
I have the Windows 8.1 x64 installation ISO (which I also burned to a DVD) that I downloaded from Microsoft, as I explained in my first post. It's what I used to try to do a repair install.
 
Are you alright with booting from the DVD, opening the command prompt, then enter the following command?
Code:
DISM /image:X:\ /cleanup-image /revertpendingactions
You need to replace X: with the letter atrributed to your Windows drive (the partition contained the Windows installation) while you are in the Recovery PE of your DVD. If you're not comfortable with that, I'll post more detailled instructions, just let me know :)
 
Now, restart your computer and try to install the same Windows Update (single KB) as before. If it fails, upload the CBS.log and WindowsUpdate.log for me please.
 
Now it's an unexpected error. Alright, follow the instructions below please.

zImGw67.png
Windows Repair All-In-One
NOTE: Before following to step below, please disable your Antivirus software or any other real-time security software that you have enabled.
  • Boot in Safe Mode with Networking;
  • Download the portable version of Windows Repair All-In-One;
  • Move the file (archive) on your Desktop, and extract it there;
  • Go in the tweaking.com_windows_repair_aio folder, then Tweaking.com - Windows Repair folder, right-click on Repair_Windows.exe and select Run as Administrator;
  • From there, click on the Next button until you are presented with an Open Repairs button and click on it;
  • Let the Registry back up complete, and move on to the check-list window;
  • Leave all the items checked by default;
  • Click on the Start Repairs button and let the scan execute;
  • If you are being prompted with a Security Warning, allow it to go through;
  • Once the repair is complete, it'll ask you to restart your computer, please do it;
 
Try to install one Windows Update again. If it fail, send me the CBS and WindowsUpdate logs.
 

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