Hello a few things I have used so I know they work well are as below.
Avast is a good free antivirus.
MVP hosts file is great as an added layer this will block a number of know bad things as well as adverts.
Malwarebytes antimalware This if the full version not free but very good will block bad Ip's in real time as well as malware and has a very good detection rate with malware dare I say it's the best out there so worth the price.
(Edit It can now replace your anti virus version 3.0)
For the browser I'd use chrome
and Avira browser safety as an addon for your browser it will help highlight and block dangerous sites.
Hope thats a little helpfull.
Edited by HolyCowZ, 12 December 2016 - 02:40 PM.