Avast Antivirus comes in various versions for Windows, macOS, Android, and iOS. And the AV services are obstructed.Īvast is one of the best internet security applications offering a myriad of features that provides security against all types of viruses and malware. Lately, numerous Avast Antivirus customers have been facing an issue after updating windows or Avast antivirus. How to Fix Avast “UI Failed to Load” Error on Windows 10