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The problem I have is that I can't install the 2018-08 Cumulative update (KB4346783). Every time I restart to install the update I get the typica 'please wait while Windows installs updates' screen with the circling dots, my PC restarts, then I get an icon in the system tray telling me that my devise is missing important updates. I check the Update History and I see 'Last failed install attempt on ‎2018-‎09-‎06 - 0x80073712' (see below).

Screenshot of my Update History, showing 7 failed updates

The last time I was able to successfully update was apparently 2018-08-25. Windows defender definition updates apparently work fine.

I've already tried a couple of steps to fix the problem with no success. I've tried using a clean boot (that is, I followed the instructions here). I then tried running the Windows Update Troubleshooter (from Update and Security > Troubleshoot). It reports 'Potential Windows Update Database error detected (fixed)', 'Windows Update components must be repaired (fixed)', 'Check for pending updates (fixed)'. Then I let Windows re-download the update and restart to install it. Same result as before - 'Your device is missing important security and quality fixes.' When I run the Update Troubleshooter again after restarting, it finds and fixes the same issues.

I'm running W10 (64-bit) version 1803 OS build 17134.1, on a personal PC (which I'm the only user of) with an AMD FX-8350 processor and 16 GB of RAM, if that helps any.

Edit: OS build is 17134.1, not 17134.4. To explain, I recently (2-3 weeks ago) had to replace my C: drive and my recovery USB was not the latest version.

Edit2: I've tried the .bat suggested by Run5K, with no success (it ran OK, but updates still don't work.). Although now Windows can't install update KB4343909 ('Failed to install on ‎2018-‎09-‎06 - 0x80073712'). I also tried manually deleting everything in C:\WINDOWS\SoftwareDistribution\Download\, with no effect.

Edit3: Followed the instructions here and manually installed update KB4346783. The log file is here. It didn't work. Windows Update reports that I need to install update KB4346783.

Edit4: So I ran DISM and SFC as suggested by Ramhound. Logs are here and here. DISM got to 84 % then quit with the error 'Error: 0x800f081f The source files could not be found.' SFC reports 'Windows Resource Protection did not find any integrity violations.' Running wmic qfe list lists only two updates installed, KB4343669 and KB4343902. I'm going to pause updates until next month, unless someone has a better idea.

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    First of all, welcome to Super User! Faced with similar circumstances, I would probably try the following: How to Reset Windows Update in Windows 10 – Run5k Sep 6 '18 at 17:57
  • What build specifically are you running? Use winver to determine this information. Update your question with this information since it's required to answer your question. – Ramhound Sep 6 '18 at 18:05
  • You are positive the build is 17134.4? If that is indeed the case, you are missing out on at least 6 months worth of cumatlive updates, 17134.4 was the first cumaltive patch released a week after 1803 was released. – Ramhound Sep 6 '18 at 18:11
  • 17134.1 indicates you have not installed a single cumulative patch in over 6 months. – Ramhound Sep 6 '18 at 18:18
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    To explain, I recently (2-3 weeks ago) had to replace my C: drive and my recovery USB was not the latest version." We are always glad to help, but that is crucial information that you should have included within your original post. – Run5k Sep 6 '18 at 18:33
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You can try to download the Windows installation tool which will be started as a normal application. https://support.microsoft.com/en-ca/help/15088/windows-10-create-installation-media

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    The Media Creation Tool will not solve the author’s problem. The only thing that took would do is cause problems for the author – Ramhound Dec 11 '18 at 12:58
  • Ultimately reinstalling Windows fixed the problem. An extreme solution, and inconvenient, but effective. – Noteless Scholar Dec 13 '18 at 21:04

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