If you are using Avast antivirus and want to uninstall it because of some issue then, you will need to open Avast by right-clicking on its icon appears in your taskbar and choosing “Open Avast! user interface”. Click on “Settings” and choose “Troubleshooting” from the left column. Now, click on the box that appears next to “Enable Avast! and close the Avast window and then, press Ctrl+ Alt+ Delete on your keyboard and choose “Task Manager” and click on Avast and call on Avast toll free number UK to get connected with the experts.