Windows 10 Antivirus?
This is one of the first questions you will probably ask yourself, if not it should be. Here's a link to that.

http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_security/anti-virus-for-windows-10-technical-preview/9f5ca9a9-f3b0-4571-8e02-963bd3af94e3?auth=1