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How to Fix Windows Update Stuck on KB3189866 in Windows 10 at 45 or 90 Percent



Many users are reporting Windows Update becoming non-responsive after attempting to install KB3189866. KB3189866 is an important security update for Windows 10 Anniversary Update and includes additional improvements.

update stuck.jpg

The best way to resolve this problem so far is to manually install KB3189866. You can do it one of two ways. Visit the Microsoft Update Catalog website using Internet Explorer:


Then download the appropriate copy of KB3189866 for your Windows 10 architecture (32 or 64 bit).

You can also download the appropriate architecture directly:



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8 hours ago, Guest Hey Rich-M said:

Hi Rich! I may have to do a clean install or a in place repair upgrade. The problem I'm having is my PC won't boot into windows after the update has completed installing. I then have to do a hard shut down. I'm then given the option to restore with another system. That's where Macrium Reflect comes into play. I choose another system and Macrium restores my OS. Very strange. I'm going to wait awhile and see if MS fixes this update bug.

Thanks for your reply! Thanks for your support. You are appreciated!;)

PS I have sent MS several complaints about my problem! Hoping they will respond soon!

And to think you gave me a real hard time earlier because I said I don't rush in to Windows updates. It's test pilots like yourself who I have to thank that go through this grief that allow the bugs to be sorted before I get my updates that go smoothly9_9

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I somehow doubt this is an MS bug because most that I have read about have fixed it by using the Microsoft Update Catalog. Most of the irreparable situations I have seen were only fixed with a clean install. The odd ball behavior and bizarre responses I see are always caused by the poor quality of the OS after an Upgrade which is why I suggested Gary do a clean install and I bet everything will run better also.

My main unit I did a clean install on 2 months ago has yet to give me the slightest issue in Windows 10 where the upgrades were causing daily issues for me.

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Thanks guys for your suggestions. I'm thinking I might try a in-place repair upgrade first and then I'll do a clean install.

I always have my Macrium Reflect to get me back were I was if needed. I will let you all know if I make any progress!;)

You all are appreciated. I have reached out my hand to the forum staff in friendship. If they chose not to except my hand , that's all I can do. I did nothing wrong. My goal has always been to help this forum grow!

My PC is setting on "The update has been installed and waiting for a restart" I'm going to let Windows decide when to restart! Windows says it will restart my PC when it's not in use, so we will see where that takes me.

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What your saying "Thanks Guys for your suggestions" but blow them out your arse, I will do it my way.

You wouldn't farkle everything if you bothered to listen to those who know what they are talking about.

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