Avast Free Antivirus is one of the best free security products you can install on your pc and mobile.It offers antivirus protection for your pc. and can remove unwanted programe. but takes lots of time to scan pc.avast gives to option to scan pc in default or can create custom scan setting as you go deeper. even it provide you proper stats about all history and all processes.I totally recommand you avast(best and free) antivirus.