Looking for Expert Help for Avast Antivirus Installation Error

I want to protect my computer system from virus attacks, so I want to use this security product to protect my files, folders and important data. I have no any idea to install Avast antivirus into the system in the correct ways. So, I’m looking for antivirus expert help or Avast antivirus customer support for complete installation of Avast antivirus. Please suggest me anyone right service provider or technician help for installing Avast antivirus successfully.