A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread.
Users reported that those exceptions appear after installing one or more Windows updates. We still haven't identified which update is causing the crashes but installing .net 4.5.1 seems to "repair" or "fix" the issue.
To fix the issue, try to install .NET 4.5.1 framework from Microsoft:
Please contact us, if you still experience issues after installing the .NET 4.5.1 framework.