Avast is one of the most powerful and effective antivirus programs offered by various top branded companies in the market. This security product foresees different kinds of virus attacks such as malware, spyware, adware and Trojans. There are different types of versions of Avast Antivirus available for users as per their needs. This security product is available in both free and paid versions. Free version provides the complete protection but paid versions have some extraordinary features. Even though, few users including windows 8 users have faced errors while using free version of this antivirus program. Follow few important instructions to learn how to uninstall avast antivirus successfully and you can also take the expert help for this issue.