VIPRE fails to open, often with a "VIPREUI.exe - This application could not be started" error.
.NET version 4.6 is required for VIPRE's user interface to run properly.
In some instances, VIPRE's install process fails to install .NET version 4.6 on computers with a clean installation of Windows 8.1. This issue occurs due to Windows requiring a specific patch (KB2919355) be installed before installing .NET v4.6.
Ensure that Microsoft patch (KB2919355) is installed and Windows is up to date.