In the world of Internet, there has been a great need of Antivirus Software to prevent from theft and virus attacks. Once we start using Internet facility on our computer on regular basis the need of Good Antivirus Software becomes must. Every year many Antivirus Software comes in market but among them only few are Best AntiVirus Software to use others are just useless. From all Antivirus Softwares some provides free copy to use for few days and than we need to upgrade if we like it but according to my knowledge all free copies are useless because free copies will never give full protection to our computer. Here i will provide with a list of Top 10 Antivirus Software rated by experts in the year 2011 and they are worth buying according to experts.