Updated: Best free antivirus software 2015

Introduction
Our best free antivirus round-up has been fully updated.Staying loyal to the trusty built-in Windows Defender keeps you safe to a certain extent but when it comes to covering your PC with a layer of protection that is a worthy of the modern age you need to go beyond that. Remember, independent testing has shown that Microsoft's layer has very poor protection rates (it typically misses one threat in six), and as such you must look elsewhere.Luckily paying through the nose for this ty