I have recently downloaded Windows Defender Beta2 and frquently get a popup ballon appear in the task bar near the clock with the following message in it,An application registration change was made for a known application file C:\program files\windows defender\mpcrun.exe. The balloon remains visible for a short time and then fades away. It does not seem to affect the pc working in any way. All the usual scans have been run. It may be that this is a normal function but as this prog is new to me can anyone confirm that it is normal. It is the same message each time. Thanks.