Windows Defender in Windows 8 suddenly starts failing to complete Quick Scan or Full Scan then turns

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When running a Quick Scan or Full Scan with Windows Defender in Windows 8 an error message will pop up stating Windows Defender cannot scan the PC and Windows Defender turns itself off and you have to restart Windows Defender to establish Real Time Protection

although it sometimes restarts itself.

 

This seems to happen when it tries to scan certain files or program files.  it is possible to find files or program folders that Windows Defender will be able to scan completely on a Custom Scan and I can isolate some folders using Custom Scan to determine

which folders are a problem by process of elimination with Custom Scan but every time I eliminate the problem folders Windows Defender finds the same problem in some other folder.

 

So problem is I cannot do a complete Quick Scan or Full Scan with Windows Defender in Windows 8.  Windows Defender was scanning properly until yesterday and has been doing fine for well over a month ever since I installed Windows 8 Pro.

 

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