Device Guard

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  • Updated 3 weeks ago
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For no apparent reason my installation of Windows 10 (Home Edition x64) came up with the following error message when rebooted:





At first I thought it might be related to Kaspersky Internet Security but I disabled it, and not change.  I eventually uninstalled SSDR v2 and the DAX drivers but no change on reinstallation.

In Windows Sound Settings normally the input and output devices can be selected, but under 'Input' I'm told no devices are found.  That's logical as it won't let me reinstall them.   

It seems Device Guard is some sort of Windows defence to prevent unwanted malware installing itself, but it's not something that I've knowingly activated and certainly not useful if it prevents me reloading the DAX drivers.

Anyone else experienced this, and if so what was the solution?

Jeff - G4IUA
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Jeff - G4IUA

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Posted 4 weeks ago

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art.carney

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I would check Kaspersky's vault to see if it "stole" something. 
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Jeff - G4IUA

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I disabled Kaspersky and rebooted, but same errors so I don't think it is a Kaspersky thing.
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Roy - W5TKZ

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Jeff, Google "Device Guard" for information on the Win 10 addition for protection. This is a Windows thing.

Roy - W5TKZ
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Greg Day, N8GD

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I'm a little puzzled.  Device Guard is supposed to be a part of Windows 10 Enterprise or Education editions. Jeff, the original poster, stated that he is running Windows 10 Home Edition x64.  I don't see how his version of Windows would be able to throw such an error when it shouldn't have Device Guard anyway.
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Rick WN2C

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Jeff - G4IUA

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I uninstalled Kaspersky in case that was the issue.  Now I don't receive any messages mentioning Device Guard.  I did look at the tenforums website but it was very offputting...and presumably my version of Windows 10 differs from the one they use as there is nowhere to enable/disable Hype-V shown.  I agree; I don't have the Education or Enterprise editions, just the plain old Home Edition where this shouldn't be a concern.

I've since looked back and found advice from Tim a few years ago, where - believe it or not - I had a similar problem with the same setup.  I've gone through uninstalling then reinstalling everything:  SmartSDR, FlexVSP and followed further advice from Tim dating back to last December:

https://helpdesk.flexradio.com/hc/en-us/articles/204017069-How-to-Manually-Re-Install-DAX-Drivers?_g...

Even that didn't work.  However I note that that relates to an earlier version (1.6.21) whereas I'm on the latest v2.1.33 but I imagine the same procedure applies.

Now the DAX Control Panel reports a Driver Error for RX Streams.  





Any more help appreciated, or even better a Teamviewer session if anyone can assist.  What started off as a relatively minor issue connecting SmartSDR, WSJT-X, JT Alert, Log4OM and PstRotator it seems to have escalated to a major one.  I'm not aware of making any changes likely to cause this and I assume this is coincidental...but I'd be happy to be proved wrong!
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Craig Williams

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The Russians are coming. Maybe they want to use your Flex radio remote?
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Jeff - G4IUA

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Kaspersky is out of the picture at the moment but I still have the problem!

What I don't understand is why removing all instances of the DAX drivers and then reinstalling them doesn't fix the problem.  I'm almost the the stage where I'm considering reinstalling Windows from scratch and starting with a completely clean slate, but that's a lot of work and I'm sure there's a simple solution somewhere.  You can see from the image above that the drivers seem to be the problem.  The error message:

Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39).

Well, if the drivers are corrupted I've attempted to uninstall and replace them, and how can they be missing?
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Jeff - G4IUA

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Showing hidden devices does show some MS ones (about which I know nothing) but I don't think there's anything harmful there...

The strange thing is that if I go to, say, DAX Audio/properties/events it says: Driver service added, then Device installed (smartdsr_audio_dax.inf).  



Hmmm.  I'm running out of ideas...Any more suggestions?
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Greg Day, N8GD

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I think you need to find out how Device Guard got implemented on a Windows 10 Home PC.  Have you looked under "Programs and Features" in the Control Panel? If it is listed there, can you try to uninstall it?  It is apparently blocking driver installations or operation, and, until you get it to stop that blocking, you're going to continue to have problems.  Is Device Guard listed under Windows Accessories, Administrative Tools, or Windows System?  If you could just get into the Device Guard configuration, you might be able to turn it off or at least prevent it from blocking DAX operation.
(Edited)
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Jeff - G4IUA

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The thing is that it doesn't seem to be part of Windows 10 Home edition, only the Enterprise version. My theory is that Kaspersky somehow misinterpreted 'something' preventing the drivers from being installed, or indeed functioning when they were already installed (and working for several weeks without issues).  Kaspersky has gone and so has this error message, but the underlying problem remains.  I did try a System Restore going back to a date before this happened but it reported as being unsuccessful.  

Nowhere can I find Device Guard (Windows Accessories, Computer Management/Services or System).  Helpfully (or not!) Windows 10 has a 'Device Performance Health' page where it correctly identified a problem with the device drivers for the Flex audio components, but of course didn't offer any useful solution.
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Roy - W5TKZ

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Jeff,

I notice that you have a printer port (LPT1) which leads me to ask the question of what is the age of your computer and also under sound, video and game controllers, the Microsoft Trusted Audio Drivers is grayed out. I don't have that listing on my computer (although My OS is Windows 10, Home, Ver 1709. So you might right click on it to get to properties and see if it is turned off or on.

Hang in there,

Roy - W5TKZ    
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Jeff - G4IUA

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Good point Roy. There isn’t a physical LPT1 port. It’s a year old PC of high spec and way beyond what is needed here.

I’ve checked just now and the greyed out MS Trusted Audio Drivers in not shown even though I’ve selected View/Show Hidden Devices.

The version is 1803 by the way, so there may be differences from your 1709.

This is now being handled by the Help Desk, so let’s see what the guys there come up with!

Thanks
Jeff - G4IUA
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Tim - W4TME, Customer Experience Manager

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Jeff,

I have a few comments.

1.) Looks like Windows Update or Kaspersky Internet Security tried to remove the DAX drivers.  
2.) The manner in which it tried to remove the DAX drivers was incorrect and it left you with half uninstalled drivers which the manual uninstaller cannot uninstall.
3

And a question:

1.) Did you do a Windows update recently?

We have seen this after Windows updates.  The new 1803 update seems to be even more destructive to the DAX drivers.

Now a course of action:

I have changed your Community post to a HelpDesk support ticket so we can investigate and hopefully resolve the issue.