[SOLVED] Can't install Defender - 0x80073701 - ERROR_SXS_ASSEMBLY_MISSING

[redtiger]

Hi Everyone

I'm having trouble installing Windows Defender on a MS Server 2016 box. I have attached the CBS log. This shows that the culprits might be KB4537764 and perhaps also KB5017305. I have also attached Frst64 (Farbar) SearchReg logs for both of these KB's. I have been able to successfully install KB5017305 using DISM but KB4537764 is no longer available.

It might be that I need to run fixlist.txt files using Frst64 against KB4537764 (and perhaps KB5017305) but I don't know how to create these. I wonder if someone might be able to help please? Thanks so much in advance, very much appreciated.

PS I have also attached a link to the COMPONENTS file in case this also helps - COMP/COMPONENTS

 

[redtiger]

Hi, is anyone able to help with this at all please?

 

[Maxstar]

Hi,

Follow these instructions to remove an update.

• Open the Start menu of Windows and type the command CMD
• When you see Command Prompt on the list, right-click on it and select Run as administrator.
• When command prompt opens, copy and paste the following command into it, then press enter.

wusa /uninstall /KB:4537764

• Let me know if it says it was successful or if there are any errors. Or take a screenshot of the command prompt window and paste it into your next reply.

 

[redtiger]

Hi Maxstar

Many thanks for the reply. Unfortunately it came back with the following error:



If there is anything further we can try that would be great and very much appreciated. Many thanks in advance.

 

[Maxstar]

Hi,

Please perform a new REG search with FRST.

Download the

Farbar Recovery Scan Tool and save it to your Desktop:

Download the 64 bit version: - Farbar Recovery Scan Tool Link

• Open the startmenu and type the command cmd.
• After you find the Command Prompt, right click on it and select Run as Administrator.
• Copy and paste the following into the Command Prompt and press enter.

reg load HKLM\COMPONENTS C:\WINDOWS\SYSTEM32\CONFIG\COMPONENTS

Right-click on the file FRST64.exe and choose Run as administrator.

• Copy and paste the following (code) into the Search box and click the Search Registry button.

KB4537764

• When the scan is complete, a message will display that SearchReg.txt is saved in the same folder FRST was started from.
• Post the logfile SearchReg.txt as attachment in your next reply.

 

[redtiger]

Thanks Maxstar
Please find the SearchReg.txt file attached.

 

[Maxstar]

Hi,

Start the

Farbar Recovery Scan Tool again.

Warning: This script was written specifically for this system. Do not run this script on another system.

• Download the attachment fixlist.txt and save it to your desktop.
• Right-click on FRST.exe and select "Run as administrator".
• Press the Fix button.
• If for some reason the tool needs a restart, please make sure you let the system restart normally.
• When finished, a log called Fixlog.txt will appear in the same directory the tool is run from.
• Post the logfile Fixlog.txt as attachment in your next reply.

Restart the system and try to install Defender, if it fails attach a new copy of the CBS log.

 

[redtiger]

Wow thanks Maxstar - this has worked and Defender has now installed! You're a genius thank you! I've still attached the fixlog for reference.

 

[Maxstar]

Hi,

You're welcome. Glad to hear you were able to install Defender now....
I'll mark this thread as solved.