WebUSB not working

try deleting all proffie drivers that were installed with zadig or dfu setup and after all have been removed connected the proffie to verify no drivers, then run https://fredrik.hubbe.net/lightsaber/proffie-dfu-setup.exe only install once, hopefully this will fix your issue

You’ll have to use the device manager.
Find the overall proffieboar device, which will be a composite usb device. One of it’s constituent parts is the webusb device. I think it should default to just winusb.sys or something. You may need to compare the working computer with the non-working one.

You can use this video for inspiration, even if it doesn’t deal explicitly with WebUSB:

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Will give that a go thank you

Interestingly, another saber works perfectly fine? I do sometimes get intermittent disconnects with the board and have to unplug and replug the USB cable, but this saber connects no problem at all…