Brilliant! This is a free non-commercial version which can be set to update automatically. You simply click on this link and then on download at the very bottom of the screen. Then follow the very simple on screen instructions. (Yes to most things.) Make sure that you click the update box and run the programme on the scheduler once a day.
An excellent free Virus remover to check a computer suspected to have a virus. On this link you will be able to run the programme - or download it free.