Is it okay to download free online anti-virus?

What are the disadvantages of free downloads anti virus online, does it have an effect on the performance of my PC? if not what would be the best free anti virus can you recommend to download.

If you want a free antivirus I recommend in order of popularity, but please choose the most suitable for you (install only one): 1. AVG Free a. A simple interface (easy to use than Avast! And Avira) b. Can detect about 82.82% of viruses Cons: The low virus detection 2. Avast! A. B. Real-Time Protection Has an option to delete a virus once found c. Can detect about 87.46% of viruses. Cons: Also many icons and confusing user interface 3. Avira AntiVir a. It can detect malware better than Avast and AVG B. It's cute umbrella icon c. Can detect about 94.26% of viruses Cons: A very sluggish update I advise against Norton Anti-virus software is filling out your computer slows down. The best anti-virus available is Kaspersky or NOD32 (recent tests at AV-comparatives.org).

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