I just sorted the same problem, been on the web for weeks looking into different ways to get around the driver issue. Stumbled onto this page that has worked fine for me.
Good luck
http://www.nokians.net/forum/bluetooth-usenet-discussions/9822-plantronics-voyager-510-usb-driver-install-problem.html
"As Plantronics doesn't seem to provide a proper solution under Vista by saying that it is Microsoft's problem and
not theirs, I went into an investigation on this matter and found out that this is (again) a traditional error with the USBAUDIO.sys file which fails some devices under Vista while it works OK under XP.
I have packed a file and share it with you guys in order to let you use your Plantronics adapter as well under Vista.
Note that as it makes use of the previous USBAUDIO.sys from XP it will obviously won't work under Vista 64.
Installation instructions:
- Download the driver pack at here.
- Unzip the contents of the downloaded file to a directory of your choice on your hard drive.
- Make sure the USB adapter of the Plantronics Voyager is inserted in your computer.
- Click on the “Start” button.
- Click on “Control Panel”.
- Double-click on the “System” icon.
- Click on “Device Manager”, in the left menu, below “Tasks”.
- Confirm the action by clicking on the “Continue” button in the next confirmation page.
- Under “Sound, video and game controllers” category you will normally find a line called “BT Plantronics Adapter”
marked with a yellow sign. This is actually the module calling the trouble and for which we will install the drivers. Double-click on the “BT Plantronics Adapter” line.
- On the default “General” tab, below “Device status”, the system shows the message “This device cannot start.
(Code 10). Click 'Check for solutions' to send data about this device to Microsoft and to see if there is a solution available.”.
Click on the “Driver” tab on the top.
- Click on the “Update driver” button.
- Click the “Browse my computer for driver software”.
- Click on “Let me pick from a list of device drivers on my computer”.
- Click on the “Have disk” button.
- Click on the “Browse” button and select the directory where you unzipped the drivers files at point 2. Then click
the “open” button and then “OK”.
- The next screen shows “USB Audio Device” below the model list. Click “Next”.
- Windows shows next a warning message indicating that it can’t verify the publisher of this driver software. Click
on “Install this driver software anyway” and wait for the installation to finish.
Windows should confirm the correct installation by the message “Windows has finished installing the driver software
for this device: USB Audio Device”.
- Installation finished. Enjoy using your Plantronics Voyager 510 under Windows Vista."