Ok, so he gets the correct VID and PID, so it is a Windows driver problem.
There are two options that you can try:
You can run the driver installation app from Adafruit that installs a bunch of drivers including the one for nRF52 USB.
Or you can try to manually install the default Windows usb_ser driver.
First open the
Control Panel then open
Device Manager and look for
Ports (COM & LPT).
Right click on the USB Serial Device (Should be COM 3 for you) and select
In the next window select
Browse my computer for drivers
Let me pick from a list of available drivers on my computer
In the next window uncheck
Show compatible hardware , then scroll down in the list to
Microsoft  and select
USB Serial Device , then push [Next] button to install the driver.