If you are using an Avast antivirus and you avast won’t open. Then, first of all, you should know the cause of the same. Here is the most popular cause of the that can lead to such problem:
If the Avast establishment is having issues, for instance, it will not open by any stretch of the imagination, the most ideal way is to fix the Avast establishment by discovering the Control Panel and afterward following the maintenance wizard. In the Program and Features window, explore Avast, right-click it and afterward select Uninstall to uninstall Avast.

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If you want to know how to download Avast antivirus or any other thing about Avast then you must read this.