Can't reinstall MSE- error code ox80070645

The problem started when KB2804527 would not install after 3 tries.I decided to uninstall MSE and reinstall it to no avail. It keeps giving me error code OX80070645. I have since tried every Mr. Fix it listed and this too produces no help. Mr. fix It says microsoft antimalware can't be stopped. Im sure the unistall of MSE left problems behind but am at a loss where to go next The registry appears to not have any lefto0vers of MSE that I can find. I am running Vista and have had MSE running on this computer for many years.
 

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Last updated May 16, 2018 Views 1,633 Applies to:
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The problem started when KB2804527 would not install after 3 tries.I decided to uninstall MSE and reinstall it to no avail. It keeps giving me error code OX80070645. I have since tried every Mr. Fix it listed and this too produces no help. Mr. fix It says microsoft antimalware can't be stopped. Im sure the unistall of MSE left problems behind but am at a loss where to go next The registry appears to not have any lefto0vers of MSE that I can find. I am running Vista and have had MSE running on this computer for many years.

You should be able to remove MSE from Control Panel.  Any problems uninstalling see: http://answers.microsoft.com/en-us/protect/forum/protect_start/uninstalling-mse/a63b8c4b-58ed-437e-8086-fa08d80725a4

Recommend you reboot the computer to ensure the uninstall is complete.    

You can download a new MSE Installation File from http://windows.microsoft.com/en-US/windows/security-essentials-download

 

Registry Fix for Error 0X80070645

See the suggested registry fix for this error by Forum User GuillaumeGabard.  Note the subsequent post by Teleraider reporting that this "fix" works.  But - if you're not comfortable working in the registry do not try this... 

http://answers.microsoft.com/en-us/protect/forum/mse-protect_start/cannot-install-microsoft-security-essentials-error/3f7b8254-1c47-e011-a756-78e7d160ad4e

Or

Try Revo Free:

http://www.revouninstaller.com/revo_uninstaller_free_download.html

 

Hope this helps...

 
MVP Consumer Security 2014-2016
Windows Insider MVP 2016-2018

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