Thanks for your help I did exactly as described how ever I still get this message written in red on the bottom of the setup finished screen with a smiley face saying, your installation is now complete etc..... then in red letters on the bottom of page (we have detected a previous antivirus is still installed on your pc for most effective security, we recommend to uninstall your previous software.) That must be windows defender it is disabled however windows defender is integrated in my control panel windows 8 and does not show up in the installed programs for removal. I don't think its hurting anything disabled and is nice to have if something happens to avast or need to uninstall avast, it will advise me to turn it on for protection. You should take this in consideration for the next avast update so people don't waste there time installing uninstalling avast or messing with windows components. Thanks for your help and other suggestions appreciated.