avast! Antivirus

Avast Antivirus protects your computer from viruses, spyware, ransomware, and other kinds of malware programs and Internet threats. Its machine-learning virus protection has the ability to detect hitherto-unknown malware. Avast Antivirus also scans for security and performance issues and tells you how to fix things. Unlike other anti-virus products, Avast Antivirus comes with a passive mode for running multiple security products in parallel.