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Thursday, February 2, 2012

Fix Microsoft Security Essentials Install Error Code 0×80070645

Ever since Microsoft has released their Microsoft Security Essentials anti-virus and anti-spyware program, I’ve used it exclusively on all my Windows machines. It does a great job and has a fairly high detection rate as compared to other free anti-virus programs.
However, I recently ran into a strange issue that caused me some grief. Everything was running fine until one day Security Essentials said it was out of date and that I had to upgrade to a newer version. Ok, no problem. After a little while, I got the following error message:

security essentials
MSE Install Error Code 0×80070645
Whoops! It would not install the latest version, so I tried multiple things such as uninstalling Microsoft Security Essentials, downloading the latest version and trying to install that way. However, that didn’t work either. I got the same error message.

I ended up having to talk to Microsoft support and they suggest a couple of things, one of which finally worked. I will mention the different possible solutions and hopefully one of them will fix your problem.
Method 1 – Delete Registry Keys

Sometimes during the upgrade, there are two registry keys that do not get removed that should not be there. Navigate to the following registry key and delete them:
HKEY_CLASSES_ROOT – Installer – UpgradeCodes – 1F69ACF0D1CF2B7418F292F0E05EC20B
You can go ahead and right-click on the 1F69ACF0D1CF2B7418F292F0E05EC20B key and choose Delete.
HKEY_LOCAL_MACHINE – SOFTWARE – Microsoft – Windows – CurrentVersion – Installer – UpgradeCodes – 1F69ACF0D1CF2B7418F292F0E05EC20B
Again, go ahead and right-click on the 1F69ACF0D1CF2B7418F292F0E05EC20B key and choose Delete.
Once you are done, close the registry editor and go ahead and restart the computer. Now try to install Microsoft Security Essentials and see if you get the error or not. If so, continue reading.
Method 2 – Run Cleanup Tools

If you ever had any other security software installed on your PC, you will need to perform a cleanup in case anything was left behind during an uninstall. Secondly, if you still having something else running like an anti-virus or anti-malware program, you should uninstall it otherwise it will cause conflicts with Security Essentials.
You can check out this link below that lists out all the different cleanup programs for software like Norton, Avira, AVG, Kaspersky, McAfee, TrendMicro, ESET, etc.
Once you perform the cleanup, go ahead and restart your computer and try installing Security Essentials again.
Method 3 – Run FixIt

You can also run the Microsoft FixIt solution, which will uninstall Microsoft Security Essentials 1.0. It will remove all remnants of the program so that you can perform a fresh install of the latest version of MSE.
If you’re having problems with version 2.0 of Security Essentials or if you installed one on top of another or something else crazy, you can follow the instructions below to completely remove Security Essentials 2.0.
Method 4 – Use Windows Update

Your last possible solution here is to use the above links to completely remove all versions of Security Essentials that you may have installed and then to go ahead and run Windows Update only our Windows machine and install version 1 of MSE.
Then, once you have MSE 1.0 installed, download the MSE 2.0 installer and go ahead and run it. This has worked for quite a few people, so if you are really having issues, then give this a shot.
Method 5 – Windows Installer

Lastly, you could possibly have an issue with Windows Installer. In that case, one program may be blocking another program from installing properly. You can download the Program Install and Uninstall Troubleshooter from Microsoft, which will fix that problem if it is occurring.
That’s about it! If you are still having issues, you might have to open a case with Microsoft and see if they can help you.

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