Thank you for posting your query on Microsoft Community.
What Anti-Virus should I install for Windows 10?
You don't need to install any Anti-Virus program, because you already have one which is Windows Defender. It protects you against Virus, Worm, Trojan, Spyware, Adware and other malicious programs same as what Microsoft Security Essentials is
doing in Windows Vista and Windows 7.
I would also suggest you to refer to the below link: