In order to fix Avast error occurred during installation, open the control panel on the system, then click “programs” further click “programs and features” then from the list select “Avast free antivirus” further click “uninstall” then click “repair” or click on the “update button” in order to get the software uninstalled, if still you are unable to get it removed then use the Avast clear tool to get it removed, once the uninstalling process completes then get the system “restarted and if you want to visit our website visit here Avast Support Number USA & http://www.avast-phone-number.com/