Windows 8/10 : Windows Defender the Microsoft Antivirus | Completely Free
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Here is the awesome Antivirus Offered by Windows itself.
Available in Latest versions of Windows Operating Systems.
Windows Defender is a software product that attempts to detect and remove malware. Initially released as an antispyware program, it was first released as a free download for Windows XP, shipped with Windows Vista by default, and currently ships with antivirus capabilities as part of Windows 10.
It's completely free !