How to get rid of questscan search or questscan virus.

what is questscan ? questscan is a search engine which hijack your browser and every time you search something on your browser it will searched on questscan. My story One day i m watching video on net and one video is not starting required some plugin for Firefox called divx. So i download the plugin from that video page called xvidsetup.exe that contain ad-ware and virus my  antivirus delete that file’s but to watch videoContinue Reading