Hi @cc7 there is a very informative new post here in documentation suggestions post #28
When using Windows and you are unsure if drivers are an issue you can open a Windows device manager window before you connect your device. Now connect the device. you will be looking for the device appear “healthy” or with a 
indicating drivers required.
Windows update should fix this for you. Please refer to the subject of updating drivers on a Fairphone if you need help with this.
Continue with your install instructions with the device manager window open. There is the possibility that Windows will have installed a driver that works in the mode where the device was introduced, but fails in a subsequent booting mode. Should reappear ask Windows update to fix it for you.