MSE install error code 0x80070645

Running XP Pro with SP3 installed and auto updates on and current and up until now running MSE with no issue. Attempted to comply MSE new version notice and above error came up during download/install.  Uninstalled the working version of MSE and attempted the MSE download/install with same error result. Ran MS cleanup program still getting error.  Definition xxxxxx645  error code and straightforward fix?

 

 

<Merged Duplicate (3) Threads>

 

Question Info

Last updated January 12, 2020 Views 65,174 Applies to:
Answer
Answer

Microsoft Support team replied with solution. 

1. Run Fix It.

2.  Remove two keys from registry left from prior MSE.

3.  Load and run Upgrade.

Solution was successful. 

 

Here's the instruction to remove the registry keys.

Please follow the below steps to delete the Microsoft Security Essentials entries under registry.

 

 Navigate to the below registry locations:

HKEY_CLASSES_ROOT > Installer > UpgradeCodes > 1F69ACF0D1CF2B7418F292F0E05EC20B

---Right click on1F69ACF0D1CF2B7418F292F0E05EC20B and delete the key

 

HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Windows > CurrentVersion > Installer > UpgradeCodes > 1F69ACF0D1CF2B7418F292F0E05EC20B

--- Right click on1F69ACF0D1CF2B7418F292F0E05EC20B and delete the key.

 

Close the Registry Editor window and restart the computer.

 

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