The main virus protection function is exactly the same for both and 'Pro' versions of avast AntiVirus. Therefore, for the vast majority of users, the free version will offer perfectly adequate protection. With that being said, the service is best utilised in conjunction with dedicated spyware and malware removal programs. antivirus is the security program that works after it’s activation with avast avast.com/activate | avast activation  |  avast insert activation code