I have not used an antivirus program on any of my Windows platforms for years. I used to use the free version of AVG, but that was a long tine ago, I do enable Windows Security and ensure security patches are up to date. But my niece asked me what she should do, and I am loathe to advise her, and later find that her security was compromised. She is running Windows 10. $40 a year for, say, McAfee, seems a lot of money to me, especially if it is no longer necessary,