It appears to be a problem with BitDefender antivirus. There's nothing you can do to fix this. I seriously doubt it's affecting that many people, but it's hard to accurately measure.
Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.
NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined
objects and unknown namespaces.