https://www.techradar.com/news/the-best-free-antivirus

When you get a new PC the first thing you should do is install some decent antivirus software. The good news is that top quality protection can be completely free, but with so much choice, picking the right one can be difficult. So we've updated our guide to getting the best software in exchange for your data and personal information.

Windows has come a long way in terms of security, but it's still fair to suggest that Windows 10's built-in antivirus solution, Windows Defender, is the last free AV app you should trust to keep your system clean.