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To delete all files in the Avast antivirus, you will need to close all programs on your computer. Now, click on “Start” and after that, “Control Panel”. After that, select the “Add/Remove Programs” menu option and then, choose the “Avast” program icon and click on the “Remove” menu choice and in the end, restart your PC and check your Avast and in case, if you are facing any issue then, call on Avast Phone Support UK to get connected with the experts for any help.