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Perhaps this old Forum Article helps: Uninstalling Microsoft Security Essentials
And/or perhaps try with free GeekUninstaller: https://geekuninstaller.com
Suggest also reading: https://support.avast.com/en-us/article/windows-xp-vista-support-faq/#pc
Antivirus for Windows vista
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Anonymous
Hi, I am trying to uninstall Microsoft Security Essentials because it longer is compatible with Vista. My computer is a dinosaur and I am not willing to change OS at this point, I feel like it would just over complicate things. MSE will not uninstall and therefore Avast is not able to install. Halp!
Windows for home | Previous Windows versions | Security and privacy
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.