Avira Free Antivirus
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Full user review
"It's got ads!"
It allows the user to edit a lot of the technical aspects of the scan. It also allows you to browse through the virus definitions, which is neat.
It's supposedly free, but it is throwing ads up on the screen. I personally don't want ads cluttering my system tray, especially if they are coming from a program that's _supposed_ to prevent that sort of thing. In addition, the interface was really getting on my nerves. The update server was very slow, the interface was difficult to understand, and it was cluttering the system tray with ads.
I uninstalled the program after the first scan was completed. It wasn't worth keeping on my computer. The deciding factor was the ads. I certainly wasn't going to let, of all things, an antivirus program throw up ads on my system tray. I much prefer some of the other free alternatives, like Avast, AVG free, or Microsoft Security Essentials.