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I have heard of Xfinity offering free Internet Security for subscribing customers......but you do have to download and INSTALL it yourself.
Just like any other AV (Anti Virus) or IS (Internet Security) program......they are not automatically put on your ocmputer, just because you subscribed to xfinity internet or TV service.
With that in mind, I can certainly help you determine if you already have AV or IS, and if you do not, I can help you get some. Whether you get it form Xfinity, or other source.....I can help either way.
The best way to do this.....is for me to have a look at your ocmputer, to determine if you have any AV or IS......and that is done with a Remote Session.
Please let me know when you are ready for the remote session.