what anti-virus software to use?

so my free trial period for mcafee is up and im wondering is it worth buying it for the next year or is there any better (or equal?) software available for free?

its not that i mind paying the fee but if i can get something the exact same for nothing, whats the point in paying for it?

im not that great of a technical mind when it comes to virus protection and would like something that will do the work for me so if it finds a virus, it automatically deletes it and i dont have to do much except maybe run the scan......

any advice appreciated