Windows 7 Bluetooth audio drivers not working.

My PC is a Dell Precision 7710 running Windows 7 Professional 64 bit OS. 32 GB RAM, with a 1TB SSD system drive.
I have trouble using Bluetooth on my Sennheiser Momentum Wireless M2 AEBT headphones.
In the device manager under sound video and Game controllers,
Bluetooth Audio properties, Device Status shows :
"Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)"

If I try Update Driver software from the device manager(from on-line), all I get is a message saying that the driver is up to date.
I am unable to use Bluetooth with the headphones, the manufacturer's manual makes no mention of having to download drivers and there is no disk supplied with the headphones.
I would like to know:-
a) Do I need Sennheiser Bluetooth drivers, the current Bluetooth audio drivers are Motorola Solutions Inc. File version 17.1.1411.0498 (c) 2014
a) if I uninstall the Bluetooth audio drivers, are there Sennheiser drivers for windows 7 which would allow me to use the headphones via Bluetooth with Windows 7 ?
b) If the Windows driver files are deleted will the PC still start up ?

The current Bluetooth Audio drivers are:
C:\Windows\System32\drivers\btmaud.sys
C:\Windows\System32\drivers\dmk.sys
C:\Windows\System32\drivers\ksthunk.sys
C:\Windows\System32\drivers\portcls.sys
LVL 2
Roger AlcindorAsked:
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RaminTechnical AdvisorCommented:
Do I need Sennheiser Bluetooth drivers ?
Drivers are embedded in Device.

If the Windows driver files are deleted will the PC still start up ?
If you uninstall the drivers for Wireless M2 AEBT headphones, then your PC can still start up with no problem.

Go to Device and printers,  from the devices list find your headphone, right click,  and select remove.
Reboot your PC and try to Pair the device again.

Reinstalling bluetooth driver can also help fixing the issue.
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nobusCommented:
did it ever work?  then do a system restore to such date
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JohnBusiness Consultant (Owner)Commented:
It does not appear there are Windows 7 drivers for these headphones. However farther down the post, it says that reinstalling (or perhaps updating) the Bluetooth drivers fixed the issue.

https://www.cnet.com/forums/discussions/windows-7-not-installing-drivers-for-sennheiser-mm100-512006/
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Roger AlcindorAuthor Commented:
I installed the latest Dell Windows drivers for the PC (RealTech)
I removed all Bluetooth devices and removed the Bluetooth audio driver (including driver files).
I re-booted the PC and checked there were no devices in the Bluetooth devices display.
I then powered on the headphones and paired the device. the PC showed tat it was connected and automatically proceeded to install device drivers but ended after a few seconds with the message that the drivers did not install successfully (Bluetooth peripheral device - No driver found)
If I power off the headphones and then a few seconds later, power on the headphones, the headphones issue a message "Connected" but the headphones have no sound signal and are not shown in the control panel Sound items.
The Bluetooth Audio Device is no longer present in the Device manager since removal as mentioned above and I am guessing that this is due to the drivers not having been installed successfully as mentioned above.
If as was previously mentioned by Ramin, the drivers are embedded in the device (headphones) then would this failure of the drivers to install, indicate a possible fault with the headphonesespecially as the indications are that the Bluetooth connection mechanism is working ?
I have disabled MalwareBytes Anti-Virus Premium to eliminate any possible effects from that.
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JohnBusiness Consultant (Owner)Commented:
It would appear from the article I posted that the headphones are not compatible with your machine.
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RaminTechnical AdvisorCommented:
Would this failure of the drivers to install, indicate a possible fault with the headphone especially as the indications are that the Bluetooth connection mechanism is working ?

I don't think so.  most of times it's a driver issue.  you can easily test it on another PC with the same Operating System and check the result.


Try the method in this link to find and uninstall every old driver related to Bluetooth (check also Sound, video  and  game  and Bluetooth Radios):
 https://www.experts-exchange.com/questions/29081635/How-to-fix-this.html
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Roger AlcindorAuthor Commented:
I went tot he Intel site and downloaded the latest driver for the Bluetooth Adapter chipset.
The file is BT_20.30.0_64_Win7.exe which updates the driver to version 20.20.0-2 dated October last year.
This compares with the current version which was 18. something but was reported as the lated version when clicking on the "update driver Software " button in the device manager.

Thanks for your comments.

Roger
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JohnBusiness Consultant (Owner)Commented:
You are very welcome and I was please to assist you with this.
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RaminTechnical AdvisorCommented:
You're welcome.
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