Symantec Antivirus Windows 7 Compatibility
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Windows 7 Antivirus Protection
Your post is in the forum for persons needing assistance with the Microsoft Security Essentials (MSE) antimalware programYou can install MSE if you wish to do so. But Avast is compatible with Windows 7 on an Acer laptop.Does your computer have prior security software on it? Download metasploit 4.8.2 windows.
If so, you should uninstall it to include using the appropriate removal tool for that software. That might be interfering with your ability to install another AV program.If you wish to use MSE and have partially or otherwise installed Avast, you can remove Avast from control Panel. You should also use the Avast Removal Tool:If you wish to use MSE please review the following:You might find the following links to be of interest:Hope this helps. MVP Consumer Security 2014-2016 Windows Insider MVP 2016-2018.