It's not just NPVR....Just saw this in the HDHR forum
On 3/14/2017 Microsoft started pushing KB4013429 via Windows Update. This update includes a bug which causes applications that use accelerated MPEG2 video decode to crash when attempting to play video.
The bug affects the HDHomeRun app in countries with MPEG2 video.
This same crash can be seen when attempting to play a DVD with the Windows DVD Player app from Microsoft.
The problem has been confirmed to be part of the OS and can't be fixed via an app-store update.
We have an open line of communication with Microsoft and we expect a KB to be released shortly.
Updates will be posted in this thread.
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