When trying to uninstall Microsoft Security Essentials on Windows Vista x86 via Programs and Features, I got an error message, code 8007066F, with no description. How can I remove Security Essentials?
The above links didn't work for me, but the response here by GlenDelport worked.
From the URL (with minor modifications):
- Browse to C:\Program Files\Microsoft Security Client\
- Locate the file Setup.exe, right click on it and choose properties
- Click on the Compatibility tab
- At the bottom of the tab click 'Change Settings for all users'
- On the next screen check the box for 'Run this program in compatibility mode for:' and choose Windows 7
- Click OK
- Click OK
- From the taskbar search box type cmd.exe and right click and choose 'Run As Administrator'. This will open an elevated command prompt as Administrator
In the command prompt window copy/paste or type the following:
cd C:\Program Files\Microsoft Security Client setup.exe /x /disableoslimit
Choose to Uninstall
- Once this has finished, reboot and Microsoft Security Essentials will be gone and Windows Defender should be running correctly.
Microsoft published a Fixit tool for this at KB 2435760. After running this, Security Essentials was removed, but I still needed to remove the executable from the startup list. I did this by going to
Start-> type in
MSCONFIG and pressing Enter. Once the MSConfig tool started, I clicked on Startup, and unticked 'Microsoft Security Essentials' from the list.
There is this Microsoft Fix It if the above link does not resolve the issue.