Which free anti virus is good for Windows 7?

I think they are all about the same. AVG, Avast, etc.

Keep in mind that keeping your computer secure requires layers of security. You may also want to install some type of URL filtering component to make sure you dont visit sites that have been flagged as malicious, dont open up emails from people you dont know, dont open untrusted attachments, never install software that's not from a reputable source and isnt signed, etc...

in our house we use microsoft security essencials,for antivirus ,amd spywareblaster for url filtering with great success

I would suggest you to go with Comodo Antivirus which is very effective in riding the internet malware threats and keep your system safe!

Comodo is not free , and yes mse is good free antivirus ,as i suggested in my last post

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