I have used Windows built-in "Defender" since I started with Windows 8 and I have no problems ..
Runs fine, catches problems like most other Antivirus programs do, and is always Free with NO pop up advertising (like some others).
Combines well with MBAM and never slows down my systems -
Spelling Edit -
Edited by noknojon, 09 July 2015 - 06:20 PM.