W11 maybe blocking DAX drivers, Flex working on solution

Ken Wells (FlexRadio HelpDesk)

Jul 30, 2025, 6:52 AM CDT

Roger,
 
Thank you for using the HelpDesk.  Let's get started addressing your issue.
 
The issue you have reported is most likely due to Windows not allowing the DAX driver to be installed due to an enabled Windows security feature known as Memory Integrity. We are aware of this issue with DAX (defect SMART-10665) and are working on a new version of the DAX drivers that do not have this limitation.  There is a possible workaround.

Memory integrity, also known as Hypervisor-protected Code Integrity (HVCI) is a Windows security feature that makes it difficult for malicious programs to use low-level drivers to hijack your computer. It is designed to prevent attacks from inserting malicious code into high-security processes.  This security feature prevents DAX from installing and running on your PC.

The current DAX driver is not malicious software and has no reported incident of it being used as an attack vector to compromise a PC, so it is a low-impact risk to disable it if DAX is reporting a problem when trying to install it on your PC.  If you disable Memory Integrity, it is recommended that you refrain from loading any third-party device drivers on your PC until you re-enable Memory Integrity.

To disable Memory Integrity, select Start, type ‘Core Isolation’ into the taskbar, and click on the Core Isolation result to open the Windows security app. From this page, you can turn off the toggle for Memory Integrity.  You can re-enable Memory Integrity by changing the on/off toggle to "on". Disabling the VMP (Virtual Machine Platform) may also be necessary.

To disable VMP select Start, type in ‘Windows Features’, and select ‘Turn Windows features on or off’ from the list of results. A new Windows Features window will open. Look for ‘Virtual Machine Platform’ within the list and deselect it. To re-enable VMP, follow the instructions and re-check the Virtual Machine Platform.
 
After disabling (or re-enabling) Memory Integrity and VMP, reboot the PC.
 
You may need to reinstall the DAX drivers using the procedure outlined in the HelpDesk article How to Manually Install/Reinstall DAX Drivers
If these workarounds do not allow the DAX drivers to be installed on your PC, I am afraid there is no other recourse until we have developed and released a new DAX driver compatible with newer Windows operating systems.
 
Please let me know if this resolves your issue.
 
Have a great day!
 
 

Ken Wells, NM9P

FlexRadio
4616 W. Howard Lane
Suite 8-860
Austin, TX USA 78728

Roger Cooper

Jul 29, 2025, 8:10 PM CDT

My main W11 computer, a 12900K got a bad virus so took a new little computer onto which I had installed W11 and SDR 3.9.19 and took its 2t nvme c: drive and put it in main computer and started rebuilding. When I ran SDR 3.9.19 I got msg in DAX that there was a driver error. Getting indications of audio in the DAX window.

Given that there might be more complications since the hard drive was taken from one computer and moved to another, should I follow procedures to reload DAX drivers or remove and reinstall SDR v.3.9.19?