Avira Free Antivirus
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Full user review
"This has a MAJOR FLAW"
Although this program will comb thru all your files, it will not quarantine or remove viruses if they are found while you are surfing the internet. All you get is a 5 second pop up telling you that it has found malware and asks you what to do. It you don't click the remove button fast enough it lets the malware in. Since most viruses infect your computer via the internet, I find this program lacking in the most essential way possible.
While it tells you about hidden objects it is extremely difficult to find them - even if they are deleted from the registry, that only deletes the registry line, and not where the actual culprit is located.
I used it faithfully until I learned more about AV's and got sick of their BUY ME pop ups. Now I use MS Security Essentials and it catches things Avira doesn't even notice. Security Essentials uses more resources, but I'd rather be safe than sorry.